Merged revisions 271902 via svnmerge from

https://origsvn.digium.com/svn/asterisk/branches/1.4

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  r271902 | mnicholson | 2010-06-22 12:31:57 -0500 (Tue, 22 Jun 2010) | 8 lines
  
  Decrease the module ref count in sip_hangup when SIP_DEFER_BYE_ON_TRANSFER is set.  This is necessary to keep the ref count correct.
  
  (closes issue #16815)
  Reported by: rain
  Patches:
        chan_sip-unref-fix.diff uploaded by rain (license 327) (modified)
  Tested by: rain
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git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@271903 65c4cc65-6c06-0410-ace0-fbb531ad65f3