[mutter] kms/impl-device-atomic: Remove useless warning

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

commit 1f3c5bd3166370a031f0b0703a75a560a1dec3d8
Author: Jonas Ådahl <jadahl gmail com>
Date:   Wed Apr 7 17:58:13 2021 +0200

    kms/impl-device-atomic: Remove useless warning
    
    No much use having a "g_return_if_fail (expr);" when we "if (expr)
    return;" just above.
    
    Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1820>

 src/backends/native/meta-kms-impl-device-atomic.c | 1 -
 1 file changed, 1 deletion(-)
---
diff --git a/src/backends/native/meta-kms-impl-device-atomic.c 
b/src/backends/native/meta-kms-impl-device-atomic.c
index 466f0fc8d5..27f52b2716 100644
--- a/src/backends/native/meta-kms-impl-device-atomic.c
+++ b/src/backends/native/meta-kms-impl-device-atomic.c
@@ -703,7 +703,6 @@ atomic_page_flip_handler (int           fd,
 
   if (!page_flip_data)
     return;
-  g_return_if_fail (page_flip_data);
 
   meta_kms_page_flip_data_set_timings_in_impl (page_flip_data,
                                                sequence, tv_sec, tv_usec);