Merged revisions 336378 via svnmerge from

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

........
  r336378 | oej | 2011-09-19 11:40:44 +0200 (Mån, 19 Sep 2011) | 9 lines
  
  Add missing unlock at MWI message sending time
  
  (closes issue ASTERISK-18573)
  
  Patches:
     sip_mwi_lock.patch (license #5041) by Gregory Hinton Nietsky
  
  Thanks to irrot for the reminder, to Gregory for the patch!
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git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/10@336381 65c4cc65-6c06-0410-ace0-fbb531ad65f3

channels/chan_sip.c

@@ -25668,6 +25668,7 @@ static int sip_send_mwi_to_peer(struct sip_peer *peer, int cache_only)
 			dialog_unlink_all(p, TRUE, TRUE);
 			dialog_unref(p, "unref dialog p just created via sip_alloc");
 			/* sip_destroy(p); */
+			ao2_unlock(peer);
 			return -1;
 		}
 		/* Recalculate our side, and recalculate Call ID */