Fix incorrect commit.

src/subs.c

@@ -92,7 +92,7 @@ static int _subs_process(struct mosquitto_db *db, struct _mosquitto_subhier *hie
 			hier->retained = NULL;
 		}
 	}
-	while(source_id && leaf && ){
+	while(source_id && leaf){
 		if(leaf->context->is_bridge && !strcmp(leaf->context->id, source_id)){
 			leaf = leaf->next;
 			continue;