format with uncrustify

src/channel.c

@@ -156,6 +156,7 @@ struct channel_set_cb_args {
 
 static void channel_set_cb(void *arg) {
   struct channel_set_cb_args *cb_args = (struct channel_set_cb_args *)arg;
+
   if (!arg) {
     LOG(LL_ERROR, ("Callback arg is NULL"));
     return;