- Do not require a space at the end of the m= string in a T38 re-invite

  Bug reported in the t38 issue report, but by mistake ignored before commit.
  Thanks to everyone informing me about this, and Corydon for helping me sort
  out sscanf :-)


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@34217 65c4cc65-6c06-0410-ace0-fbb531ad65f3