Merged revisions 271902 via svnmerge from

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

........
  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

channels/chan_sip.c

@@ -5701,6 +5701,7 @@ static int sip_hangup(struct ast_channel *ast)
 		sip_pvt_lock(p);
 		p->owner = NULL;  /* Owner will be gone after we return, so take it away */
 		sip_pvt_unlock(p);
+		ast_module_unref(ast_module_info->self);
 		return 0;
 	}