* nta: clarify outgoing_ack() logic
  Ignore-this: a745b3e7df63835d9768ec9dc3d5c5b2
  
  Coverity issue.


git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@13354 d0543943-73ff-0310-b7d9-9358b9ac24b2