wayland: Avoid criticals when unsetting transient parents

Must not check the display when parent is NULL.

diff --git a/gdk/wayland/gdksurface-wayland.c b/gdk/wayland/gdksurface-wayland.c
index 4269ce97a843ce795bffd3b7814140b3923c428c..06de4fa500690f415446282e1d71f6c4ce20e38e 100644 (file)
--- a/gdk/wayland/gdksurface-wayland.c
+++ b/gdk/wayland/gdksurface-wayland.c
@@ -3359,8 +3359,8 @@ gdk_wayland_toplevel_set_transient_for (GdkWaylandToplevel *toplevel,
                                         GdkSurface         *parent)
 {
   g_return_if_fail (!parent || GDK_IS_WAYLAND_TOPLEVEL (parent));
-  g_return_if_fail (gdk_surface_get_display (GDK_SURFACE (toplevel)) ==
-                    gdk_surface_get_display (parent));
+  g_return_if_fail (!parent ||
+                    gdk_surface_get_display (GDK_SURFACE (toplevel)) == gdk_surface_get_display (parent));
 
   if (parent)
     {