remove questionable idiom

scripts/ci/extras/erlangbuilder.sh

@@ -13,7 +13,7 @@ if [ -z "$1" ]; then
   exit 1;
 fi
 
-(mkdir -p rpmbuild && cd $_ && mkdir -p SOURCES BUILD BUILDROOT i386 x86_64 SOURCES SPECS)
+(mkdir -p rpmbuild && cd rpmbuild && mkdir -p SOURCES BUILD BUILDROOT i386 x86_64 SOURCES SPECS)
 cd $src_repo
 
 rpmbuild --define "_topdir %(pwd)/rpmbuild" \

scripts/ci/get_extra_sources.sh

@@ -8,7 +8,7 @@ if [ ! -d .git ]; then
   exit 1;
 fi
 
-(mkdir -p rpmbuild && cd $_ && mkdir -p SOURCES BUILD BUILDROOT i386 x86_64 SOURCES SPECS)
+(mkdir -p rpmbuild && cd rpmbuild && mkdir -p SOURCES BUILD BUILDROOT i386 x86_64 SOURCES SPECS)
 
 cd $src_repo/rpmbuild/SOURCES
 

scripts/ci/rpmbuilder.sh

@@ -14,7 +14,7 @@ dst_name="freeswitch-$cmajor.$cminor.$cmicro"
 dst_parent="/tmp/"
 dst_dir="/tmp/$dst_name"
 
-(mkdir -p rpmbuild && cd $_ && mkdir -p SOURCES BUILD BUILDROOT i386 x86_64 SPECS)
+(mkdir -p rpmbuild && cd rpmbuild && mkdir -p SOURCES BUILD BUILDROOT i386 x86_64 SPECS)
 
 cd $src_repo