Merged revisions 371271 via svnmerge from

Merged revisions 371271 via svnmerge from
file:///srv/subversion/repos/asterisk/branches/10

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  r371271 | kmoore | 2012-08-15 15:15:08 -0500 (Wed, 15 Aug 2012) | 12 lines

  Avoid unconditional NULLing of mwipvt on relatedpeer on SIP dialog destruction

  The other instance of this bug was fixed by jcolp/file in r121496. If
  we are destroying a dialog only set the MWI dialog pointer on the
  related peer to NULL if it is the dialog currently being destroyed.

  (closes issue ASTERISK-20119)
  Patch-by: Misha Vodsedalek
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  Merged revisions 371270 from http://svn.asterisk.org/svn/asterisk/branches/1.8
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git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/10-digiumphones@371294 65c4cc65-6c06-0410-ace0-fbb531ad65f3