Fix another bug (don't commit without compiling)

Also don't code in anger

libobs/obs-scene.c

@@ -117,10 +117,12 @@ static inline void attach_sceneitem(struct obs_scene_item *item,
 
 static void scene_video_render(void *data)
 {
+	struct obs_scene *scene = data;
+	struct obs_scene_item *item;
+
 	pthread_mutex_lock(&scene->mutex);
 
-	struct obs_scene *scene = data;
-	struct obs_scene_item *item = scene->first_item;
+	item = scene->first_item;
 
 	while (item) {
 		if (obs_source_removed(item->source)) {