[gtk+] gdk: Add some parameter checking

[Matthias Clasen <matthiasc src gnome org>]

commit bb29c1fcc5398ae5cc236328ea7d5d6f0fdfb476
Author: Matthias Clasen <mclasen redhat com>
Date:   Fri Jul 17 18:37:20 2015 -0400

    gdk: Add some parameter checking
    
    This may help coverity recognize that we're not called with
    invalid combinations.

 gdk/gdkwindow.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/gdk/gdkwindow.c b/gdk/gdkwindow.c
index af3d17a..f6516e5 100644
--- a/gdk/gdkwindow.c
+++ b/gdk/gdkwindow.c
@@ -9872,6 +9872,8 @@ gdk_window_set_geometry_hints (GdkWindow         *window,
                               const GdkGeometry *geometry,
                               GdkWindowHints     geom_mask)
 {
+  g_return_if_fail (geometry != NULL || geom_mask == 0);
+
   GDK_WINDOW_IMPL_GET_CLASS (window->impl)->set_geometry_hints (window, geometry, geom_mask);
 }