quartz: GdkDeviceCore: check for NULL pointer

diff --git a/gdk/quartz/gdkdevice-core.c b/gdk/quartz/gdkdevice-core.c
index 3244a438c55ee4714b0a852e9a92c6817fa436ed..65c24fa89022e9ccf05674ee08d7f1dd84bd12d3 100644 (file)
--- a/gdk/quartz/gdkdevice-core.c
+++ b/gdk/quartz/gdkdevice-core.c
@@ -241,8 +241,11 @@ gdk_device_core_query_state_helper (GdkWindow       *window,
     translate_coords_to_child_coords (window, found_window,
                                       &x_tmp, &y_tmp);
 
-  *x = x_tmp;
-  *y = y_tmp;
+  if (x)
+    *x = x_tmp;
+
+  if (y)
+    *y = y_tmp;
 
   return found_window;
 }