[gtk+/gtk-3-22] window: Avoid redundantly getting the GDK window

[Daniel Boles <dboles src gnome org>]

commit ad536f333bfba825ad8c9445c70c83b5c05d6c02
Author: Timm Bäder <mail baedert org>
Date:   Fri Dec 29 08:52:14 2017 +0100

    window: Avoid redundantly getting the GDK window
    
    meta-pick of commit c1573a1fda7c3b917b6809795b9668629fe58883: the
    variable gdk_window is used in a check, but we may as well use it again
    to avoid calling _gtk_widget_get_window() again unnecessarily.

 gtk/gtkwindow.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/gtk/gtkwindow.c b/gtk/gtkwindow.c
index 26cac43..2b89332 100644
--- a/gtk/gtkwindow.c
+++ b/gtk/gtkwindow.c
@@ -4552,7 +4552,7 @@ gtk_window_realize_icon (GtkWindow *window)
 
   info->realized = TRUE;
 
-  gdk_window_set_icon_list (_gtk_widget_get_window (widget), icon_list);
+  gdk_window_set_icon_list (gdk_window, icon_list);
   if (GTK_IS_HEADER_BAR (priv->title_box))
     _gtk_header_bar_update_window_icon (GTK_HEADER_BAR (priv->title_box), window);