[mutter/gnome-3-28] window: Fix a small memory leak

[Marco Trevisan <marcotrevi src gnome org>]

commit 2da2489da54c2eb6580d5a655a6723514ab8bc04
Author: Georges Basile Stavracas Neto <georges stavracas gmail com>
Date:   Wed Mar 21 21:16:23 2018 -0300

    window: Fix a small memory leak
    
    
    (cherry picked from commit 63e2c0329f12401ef3c93201b53c463142e7a9ca)

 src/core/window.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/src/core/window.c b/src/core/window.c
index 565698da9..86f9d69b1 100644
--- a/src/core/window.c
+++ b/src/core/window.c
@@ -5268,7 +5268,7 @@ static cairo_surface_t *
 load_default_window_icon (int size)
 {
   GtkIconTheme *theme = gtk_icon_theme_get_default ();
-  GdkPixbuf *pixbuf;
+  g_autoptr (GdkPixbuf) pixbuf = NULL;
   const char *icon_name;
 
   if (gtk_icon_theme_has_icon (theme, META_DEFAULT_ICON_NAME))