[mutter] renderer-native: Fix GObjectify oversight

[verdre <jonasd src gnome org>]

commit b2f2050b955870c5313decdbbeec0301d844200e
Author: Robert Mader <robert mader posteo de>
Date:   Sun Oct 18 11:22:31 2020 +0200

    renderer-native: Fix GObjectify oversight
    
    This was forgotten in eb14da3874fd7044c, triggering crashes.
    
    https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1510

 src/backends/native/meta-renderer-native.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/src/backends/native/meta-renderer-native.c b/src/backends/native/meta-renderer-native.c
index d28a81f6de..3fa3d74006 100644
--- a/src/backends/native/meta-renderer-native.c
+++ b/src/backends/native/meta-renderer-native.c
@@ -1253,7 +1253,7 @@ dummy_power_save_page_flip_cb (gpointer user_data)
   g_list_foreach (renderer_native->power_save_page_flip_onscreens,
                   (GFunc) dummy_power_save_page_flip, NULL);
   g_list_free_full (renderer_native->power_save_page_flip_onscreens,
-                    (GDestroyNotify) cogl_object_unref);
+                    g_object_unref);
   renderer_native->power_save_page_flip_onscreens = NULL;
   renderer_native->power_save_page_flip_source_id = 0;