chan_sip: Fix dialog reference leaked to scheduler for reinvite_timeout.

Release the scheduler reference to the dialog for reinvite timeout during
dialog_unlink_all.

ASTERISK-24876 #close 
Reported by: Corey Farrell
Review: https://reviewboard.asterisk.org/r/4491/
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Merged revisions 433112 from http://svn.asterisk.org/svn/asterisk/branches/11
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Merged revisions 433113 from http://svn.asterisk.org/svn/asterisk/branches/13


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@433114 65c4cc65-6c06-0410-ace0-fbb531ad65f3

channels/chan_sip.c

@@ -3340,6 +3340,10 @@ void dialog_unlink_all(struct sip_pvt *dialog)
 
 	AST_SCHED_DEL_UNREF(sched, dialog->initid, dialog_unref(dialog, "when you delete the initid sched, you should dec the refcount for the stored dialog ptr"));
 
+	if (dialog->reinviteid > -1) {
+		AST_SCHED_DEL_UNREF(sched, dialog->reinviteid, dialog_unref(dialog, "clear ref for reinvite_timeout"));
+	}
+
 	if (dialog->autokillid > -1) {
 		AST_SCHED_DEL_UNREF(sched, dialog->autokillid, dialog_unref(dialog, "when you delete the autokillid sched, you should dec the refcount for the stored dialog ptr"));
 	}