output: remove surface buffer damage check

A surface can have effective damage even without any buffer damage
committed.

sway/desktop/output.c

@@ -633,7 +633,6 @@ static void damage_surface_iterator(struct sway_output *output,
 	struct wlr_box box = *_box;
 	scale_box(&box, output->wlr_output->scale);
 
-	if (pixman_region32_not_empty(&surface->buffer_damage)) {
 	pixman_region32_t damage;
 	pixman_region32_init(&damage);
 	wlr_surface_get_effective_damage(surface, &damage);
@@ -647,7 +646,6 @@ static void damage_surface_iterator(struct sway_output *output,
 	pixman_region32_translate(&damage, box.x, box.y);
 	wlr_output_damage_add(output->damage, &damage);
 	pixman_region32_fini(&damage);
-	}
 
 	if (whole) {
 		wlr_output_damage_add_box(output->damage, &box);