When unloading app_meetme destroy any auto created contexts created by SLA.

(closes issue #11367)
Reported by: eliel


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.4@89571 65c4cc65-6c06-0410-ace0-fbb531ad65f3

apps/app_meetme.c

@@ -4482,6 +4482,9 @@ static void sla_destroy(void)
 		pthread_join(sla.thread, NULL);
 	}
 
+	/* Drop any created contexts from the dialplan */
+	ast_context_destroy(NULL, sla_registrar);
+
 	ast_mutex_destroy(&sla.lock);
 	ast_cond_destroy(&sla.cond);
 }