[gtk+] Fix a warning

[Matthias Clasen <matthiasc src gnome org>]

commit b2b4a3bb0a6ffcc8d1f46a4ba7bcee2f87cc3f08
Author: Matthias Clasen <mclasen redhat com>
Date:   Sun Jul 26 01:49:19 2015 -0400

    Fix a warning

 gtk/gtkwindow.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/gtk/gtkwindow.c b/gtk/gtkwindow.c
index dc063e2..9ed7ee3 100644
--- a/gtk/gtkwindow.c
+++ b/gtk/gtkwindow.c
@@ -6070,7 +6070,7 @@ gtk_window_map (GtkWidget *widget)
       return;
     }
 
-  screen = gtk_window_get_screen (widget);
+  screen = gtk_window_get_screen (window);
   if (priv->initial_fullscreen_monitor > gdk_screen_get_n_monitors (screen))
     priv->initial_fullscreen_monitor = -1;