[mutter/gnome-3-14] build: Fix return value in meta-sync-ring.c

[Rui Matos <rtcm src gnome org>]

commit 9b1d436854bd353668565b921248f7e22671ea8d
Author: Ting-Wei Lan <lantw src gnome org>
Date:   Sat Aug 8 20:12:09 2015 +0800

    build: Fix return value in meta-sync-ring.c
    
    https://bugzilla.gnome.org/show_bug.cgi?id=753380

 src/compositor/meta-sync-ring.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/src/compositor/meta-sync-ring.c b/src/compositor/meta-sync-ring.c
index 44b1c41..217ebe5 100644
--- a/src/compositor/meta-sync-ring.c
+++ b/src/compositor/meta-sync-ring.c
@@ -499,7 +499,7 @@ meta_sync_ring_after_frame (void)
   if (!ring)
     return FALSE;
 
-  g_return_if_fail (ring->xdisplay != NULL);
+  g_return_val_if_fail (ring->xdisplay != NULL, FALSE);
 
   if (ring->warmup_syncs >= NUM_SYNCS / 2)
     {
@@ -542,7 +542,7 @@ meta_sync_ring_insert_wait (void)
   if (!ring)
     return FALSE;
 
-  g_return_if_fail (ring->xdisplay != NULL);
+  g_return_val_if_fail (ring->xdisplay != NULL, FALSE);
 
   if (ring->current_sync->state != META_SYNC_STATE_READY)
     {