If the SLA thread is not started, then reload causes a memory leak.

(closes issue #13889)
 Reported by: eliel
 Patches: 
       app_meetme.c.patch uploaded by eliel (license 64)


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.4@156294 65c4cc65-6c06-0410-ace0-fbb531ad65f3

apps/app_meetme.c

@@ -1330,6 +1330,10 @@ static void sla_queue_event_full(enum sla_event_type type,
 {
 	struct sla_event *event;
 
+	if (sla.thread == AST_PTHREADT_NULL) {
+		return;
+	}
+
 	if (!(event = ast_calloc(1, sizeof(*event))))
 		return;