[gtk+] Initialize variables

[Matthias Clasen <matthiasc src gnome org>]

commit b6551c84c9fcd1c63f4fe8055e016f41cf7c4985
Author: Matthias Clasen <mclasen redhat com>
Date:   Sat Jan 24 16:45:04 2015 -0500

    Initialize variables
    
    No need to risk valgrind complaints about initialized
    values.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=743422

 gdk/gdkwindow.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/gdk/gdkwindow.c b/gdk/gdkwindow.c
index b791066..6960cae 100644
--- a/gdk/gdkwindow.c
+++ b/gdk/gdkwindow.c
@@ -4661,6 +4661,8 @@ gdk_window_get_device_position_double (GdkWindow       *window,
   g_return_val_if_fail (GDK_IS_DEVICE (device), NULL);
   g_return_val_if_fail (gdk_device_get_source (device) != GDK_SOURCE_KEYBOARD, NULL);
 
+  tmp_x = tmp_y = 0;
+  tmp_mask = 0;
   normal_child = GDK_WINDOW_IMPL_GET_CLASS (window->impl)->get_device_state (window,
                                                                              device,
                                                                              &tmp_x, &tmp_y,