backend/drm: move drm_plane_finish_surface() to drm.c

This function touches queued_fb/current_fb, which the renderer has
nothing to do with.

backend/drm/drm.c

@@ -305,6 +305,17 @@ error_res:
 	return false;
 }
 
+static void drm_plane_finish_surface(struct wlr_drm_plane *plane) {
+	if (!plane) {
+		return;
+	}
+
+	drm_fb_clear(&plane->queued_fb);
+	drm_fb_clear(&plane->current_fb);
+
+	finish_drm_surface(&plane->mgpu_surf);
+}
+
 void finish_drm_resources(struct wlr_drm_backend *drm) {
 	if (!drm) {
 		return;

backend/drm/renderer.c

@@ -41,7 +41,7 @@ void finish_drm_renderer(struct wlr_drm_renderer *renderer) {
 	wlr_renderer_destroy(renderer->wlr_rend);
 }
 
-static void finish_drm_surface(struct wlr_drm_surface *surf) {
+void finish_drm_surface(struct wlr_drm_surface *surf) {
 	if (!surf || !surf->renderer) {
 		return;
 	}
@@ -121,18 +121,6 @@ error_tex:
 	return NULL;
 }
 
-
-void drm_plane_finish_surface(struct wlr_drm_plane *plane) {
-	if (!plane) {
-		return;
-	}
-
-	drm_fb_clear(&plane->queued_fb);
-	drm_fb_clear(&plane->current_fb);
-
-	finish_drm_surface(&plane->mgpu_surf);
-}
-
 bool drm_plane_pick_render_format(struct wlr_drm_plane *plane,
 		struct wlr_drm_format *fmt, struct wlr_drm_renderer *renderer) {
 	const struct wlr_drm_format_set *render_formats =

include/backend/drm/renderer.h

@@ -31,12 +31,12 @@ void finish_drm_renderer(struct wlr_drm_renderer *renderer);
 bool init_drm_surface(struct wlr_drm_surface *surf,
 	struct wlr_drm_renderer *renderer, int width, int height,
 	const struct wlr_drm_format *drm_format);
+void finish_drm_surface(struct wlr_drm_surface *surf);
 
 struct wlr_buffer *drm_surface_blit(struct wlr_drm_surface *surf,
 	struct wlr_buffer *buffer);
 
 bool drm_plane_pick_render_format(struct wlr_drm_plane *plane,
 	struct wlr_drm_format *fmt, struct wlr_drm_renderer *renderer);
-void drm_plane_finish_surface(struct wlr_drm_plane *plane);
 
 #endif