Merged revisions 292016 via svnmerge from

https://origsvn.digium.com/svn/asterisk/branches/1.8

........
  r292016 | twilson | 2010-10-15 16:40:56 -0500 (Fri, 15 Oct 2010) | 5 lines
  
  Ref/unref res_srtp when we create/destroy a session
  
  This avoids unhappy crashing when we try to 'core stop gracefully' and res_srtp
  tries to unload before chan_sip does. Thanks, Russell!
........


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@292017 65c4cc65-6c06-0410-ace0-fbb531ad65f3