Fix crash encountered by the testsuite.

Running testsuite tests locally produced no errors, but when
run using the continuous integration framework, crashes occurred.

The crashes occurred due to a refcounting error that had been fixed
for a similar situation.



git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/13@420758 65c4cc65-6c06-0410-ace0-fbb531ad65f3

res/res_pjsip_pubsub.c

@@ -2032,7 +2032,10 @@ int ast_sip_subscription_notify(struct ast_sip_subscription *sub, void *notify_d
 	if (sub->tree->notification_batch_interval) {
 		return schedule_notification(sub->tree);
 	} else {
+		/* See the note in pubsub_on_rx_refresh() for why sub->tree is refbumped here */
+		ao2_ref(sub->tree, +1);
 		return send_notify(sub->tree, 0);
+		ao2_ref(sub->tree, -1);
 	}
 }