Merged revisions 340031 via svnmerge from

https://origsvn.digium.com/svn/asterisk/branches/10

........
  r340031 | wedhorn | 2011-10-10 09:18:27 +1100 (Mon, 10 Oct 2011) | 8 lines
  
  Return -1 to skinny_session if register rejected.
  
  If device registration is rejected, return -1 so that the session is
  destroyed immediately. Previously, a segfault would occur on a 
  graceful shutdown if a register is rejected and the skinny_session
  has not yet timed out.
........


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@340032 65c4cc65-6c06-0410-ace0-fbb531ad65f3