Fix a memory leak that I just noticed in the device state handling in app_queue.

On most device state changes, it would leak roughly 8 to 64 bytes (the length of
the name of the device).


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.2@65389 65c4cc65-6c06-0410-ace0-fbb531ad65f3

apps/app_queue.c

@@ -540,6 +540,8 @@ static void *changethread(void *data)
 	}
 	ast_mutex_unlock(&qlock);
 
+	free(sc);
+
 	return NULL;
 }