[mutter] backend: Cleanup renderer on shutdown

[Marge Bot <marge-bot src gnome org>]

commit c4a73e795020722eda3e2bec0c16d96f9f37333b
Author: Jonas Ådahl <jadahl gmail com>
Date:   Sat Apr 10 00:45:01 2021 +0200

    backend: Cleanup renderer on shutdown
    
    This removes left-over views, and related resources.
    
    Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1822>

 src/backends/meta-backend.c | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/src/backends/meta-backend.c b/src/backends/meta-backend.c
index e40452d030..ff84bfe6a9 100644
--- a/src/backends/meta-backend.c
+++ b/src/backends/meta-backend.c
@@ -244,6 +244,7 @@ meta_backend_dispose (GObject *object)
   g_clear_pointer (&priv->default_seat, clutter_seat_destroy);
   g_clear_pointer (&priv->stage, clutter_actor_destroy);
   g_clear_pointer (&priv->clutter_backend, clutter_backend_destroy);
+  g_clear_object (&priv->renderer);
   g_clear_list (&priv->gpus, g_object_unref);
 
   G_OBJECT_CLASS (meta_backend_parent_class)->dispose (object);