`switch_core_hash_first` allocates an iterator on each call that is
never freed except when the hash table is empty.

By using `switch_core_hash_first_iter` we allocate only one iterator,
and that iterator is freed after the last item is processed.

We're using -Wno-unused-result to work around what is arguably a GCC
bug, but this option is not supported on older GCC versions.  So on
those versions we won't pass -Werror either.

ref: commit b874048e

mod_unimrcp: remove some dead code and TODOs.  Reworked error handling a bit to try and prevent stuck channel

It's reasonable for someone to change one or more of these directory
permissions after installation.  We shouldn't touch more than we need
on upgrade.  Each directory needs to be owned by the freeswitch user,
but past that we can leave discretion to the system administrator.

In some configurations where many limits are used, the limit increases
and releases were generating a lot of noise and making it harder to
see when limits were exceeded, which was at the same log level.

As an example of using mod_sofia's gateway parameter `contact-params`
we'd used the value `tport=tcp`.  Looking around, it's clear this has
misled people into believing you can specify `tport=tcp` to make the
gateway use TCP or `tport=tls` to make the gateway use TLS.  This does
not work.

The actual contact parameter is named `transport` rather than `tport`,
and you shouldn't use `transport` in `contact-params` because we
automatically add a `transport` to the Contact: based on the value of
`register-transport` (even if the gateway is set to not register).

It's clear why this would be confusing, so we'll just remove this as
an example.

In some cases where `redisplay()` is called immediately after a
command is run (e.g. `log ...`) we often get a prompt, junk output,
and a second prompt.  This is due to a (known) race.

We believe we're falling afoul of this code in `el_deletestr`:

    if (el->el_line.cursor < &el->el_line.buffer[n])
            return;

Basing the length of text to delete off of the cursor position
resolves the issue of junk text, but the real solution is to eliminate
the race conditions, which will also resolve the sometimes duplicated
prompt.

FS-6764 #resolve

Thanks-to: Nathan Neulinger <nneul@neulinger.org>

Merge pull request #29 in FS/freeswitch from ~ITALOROSSI/freeswitch:bugfix/FS-5522-add-switchname-xml-json-cdr to master

* commit 'd55505ce':
  Adding switchname to xml_cdr and json_cdr

Modern static analyzers warn when a variable is set but not used.  GCC
warns when the result of a function marked as
`__attribute__((warn_unused_result))` is not set to some variable,
even when the function is cast to `(void)`, which is the recognized
way of indicating the intent to ignore the result.  We treat all
warnings as errors.

The combination of behaviors here makes it difficult if we really
don't care about the result of the function; the obvious workarounds
are precluded.

GCC's maintainers don't consider this to be a bug:

  Why do you think this is a bug?  warn_unused_result is for cases where
  "not checking the result is either a security problem or always a
  bug".

  https://gcc.gnu.org/bugzilla/show_bug.cgi?id=25509#c1

GLIBC however marks functions like `read` and `write` with this
attribute.  While it certainly in most cases is correct to act on
their return value, in some cases we really just don't care.

So when we see that we're building with GCC, and that we're building
with all warnings enabled, we'll just pass -Wno-unused-result to
disable the warning.

ref: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=25509
ref: https://gcc.gnu.org/onlinedocs/gcc/Warning-Options.html

Clang's static analyzer thinks we could be using `hosts` here when it
is NULL.  We probably weren't, but it's easy to see how it could think
so.  We were checking whether `from_addr` matched `ice->addr` three
times, and between the second on third time we might have modified the
`ice->addr`; however we only get there if it matched the second time,
so we could only make it not match at that point and avoid the third
branch.  We can't make it match where it did not before.

We'll simplify the logic a bit here so static analyzers (and humans)
can hopefully see this more readily.

When zero was passed for the size to `sub_alloc`, we were passing this
size on to `malloc` or `calloc`, which is unusual enough that static
analyzers warn about this (POSIX says that either NULL or a pointer
will be returned).

We'll instead just return NULL right away.

When the number of channels was zero, we were calling malloc with a
size of zero.  While defined, this is unusual.  And since we're
initializing the speex resampler as though there were one channel in
this case, we should probably just allocate the space for it.

Clang's static analyzer noticed the result of realloc was being
assigned to a pointer of a different type than was used to calculate
the new size.  We can make things simpler and more idiomatic here by
using the correct pointer type and letting C's pointer arithmetic
automatically handle some multiplication.

We also use the distributive property here to simplify the calculation
for memset.

The `switch_split_date` and `switch_split_time` functions only set as
many variables as they believe exist values in the input string.
Since we didn't have defaults assigned we would read undefined stack
memory if the input string didn't contain e.g. an hour.

With this commit, we use 1970 if no year is present, January if no
month is present, the first day of the month if none is given, and
zero for each of a missing hour, minute, or second.

We're moving the variable declarations down to the smallest possible
scope (a good idea in general) so we can address the use of undefined
memory by the function in a later commit.

mod_curl currently does not verify the authenticity of the peer's
certificate, and does not verify whether the common name on the
certificate matches the server.  This makes mod_curl initiated TLS
connections completely insecure.  We should fix this, but until we do,
we'll warn people that it's not doing what they may think it is.

ref: http://curl.haxx.se/libcurl/c/CURLOPT_SSL_VERIFYPEER.html
ref: http://curl.haxx.se/libcurl/c/CURLOPT_SSL_VERIFYHOST.html

* commit 'c736cf2f':
  Add sofia gateway parameter "destination-prefix"
  FS-5497 add sofia gateway parameter destination-prefix in case you need to send Invites with prefix only to this gateway