[gtk+] stylecontext: Fix list_classes() after optimization

[Garrett Regier <gregier src gnome org>]

commit 6118893a4ea75d9f94e5e68ed1c8e0ae73442926
Author: Garrett Regier <garrettregier gmail com>
Date:   Fri Sep 11 09:46:34 2015 -0700

    stylecontext: Fix list_classes() after optimization
    
    Otherwise a junk value is returned.

 gtk/gtkstylecontext.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/gtk/gtkstylecontext.c b/gtk/gtkstylecontext.c
index 643a17b..ddc0d11 100644
--- a/gtk/gtkstylecontext.c
+++ b/gtk/gtkstylecontext.c
@@ -1391,7 +1391,7 @@ GList *
 gtk_style_context_list_classes (GtkStyleContext *context)
 {
   GtkStyleContextPrivate *priv;
-  GList *classes_list;
+  GList *classes_list = NULL;
   const GQuark *classes;
   guint n_classes, i;
   const gchar *quark_str;