[mutter] backends/x11: Unref keymap on finalize

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

commit 0e396ee7bb38d485b3a2284637bd15c69c7ce062
Author: Sebastian Keller <skeller gnome org>
Date:   Thu Feb 11 15:46:13 2021 +0100

    backends/x11: Unref keymap on finalize
    
    Despite keymaps being relatively large, this does not really have much
    of an impact, because there is only ever one and it's only leaked on
    shutdown.
    
    Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1728>

 src/backends/x11/meta-backend-x11.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)
---
diff --git a/src/backends/x11/meta-backend-x11.c b/src/backends/x11/meta-backend-x11.c
index 9c40ada2c1..ae1a916280 100644
--- a/src/backends/x11/meta-backend-x11.c
+++ b/src/backends/x11/meta-backend-x11.c
@@ -874,6 +874,17 @@ meta_backend_x11_dispose (GObject *object)
   G_OBJECT_CLASS (meta_backend_x11_parent_class)->dispose (object);
 }
 
+static void
+meta_backend_x11_finalize (GObject *object)
+{
+  MetaBackendX11 *x11 = META_BACKEND_X11 (object);
+  MetaBackendX11Private *priv = meta_backend_x11_get_instance_private (x11);
+
+  g_clear_pointer (&priv->keymap, xkb_keymap_unref);
+
+  G_OBJECT_CLASS (meta_backend_x11_parent_class)->finalize (object);
+}
+
 static void
 meta_backend_x11_class_init (MetaBackendX11Class *klass)
 {
@@ -881,6 +892,7 @@ meta_backend_x11_class_init (MetaBackendX11Class *klass)
   GObjectClass *object_class = G_OBJECT_CLASS (klass);
 
   object_class->dispose = meta_backend_x11_dispose;
+  object_class->finalize = meta_backend_x11_finalize;
   backend_class->create_clutter_backend = meta_backend_x11_create_clutter_backend;
   backend_class->post_init = meta_backend_x11_post_init;
   backend_class->grab_device = meta_backend_x11_grab_device;