backend: destroy renderer when destroying backend

backend/headless/backend.c

@@ -54,6 +54,7 @@ static void backend_destroy(struct wlr_backend *wlr_backend) {
 
 	wlr_signal_emit_safe(&wlr_backend->events.destroy, backend);
 
+	wlr_renderer_destroy(backend->renderer);
 	wlr_egl_finish(&backend->egl);
 	free(backend);
 }

backend/wayland/backend.c

@@ -88,6 +88,7 @@ static void wlr_wl_backend_destroy(struct wlr_backend *wlr_backend) {
 	free(backend->seat_name);
 
 	wl_event_source_remove(backend->remote_display_src);
+	wlr_renderer_destroy(backend->renderer);
 	wlr_egl_finish(&backend->egl);
 	if (backend->seat) {
 		wl_seat_destroy(backend->seat);

backend/x11/backend.c

@@ -239,6 +239,7 @@ static void wlr_x11_backend_destroy(struct wlr_backend *backend) {
 	}
 	wl_list_remove(&x11->display_destroy.link);
 
+	wlr_renderer_destroy(x11->renderer);
 	wlr_egl_finish(&x11->egl);
 
 	if (x11->cursor) {