[gtk+/composite-templates] Fix a memory leak in GtkCssStringValue

[Juan Pablo Ugarte <jpu src gnome org>]

commit 6206ded57aaf07c6690977dc15be9cad4edf0ebd
Author: Matthias Clasen <mclasen redhat com>
Date:   Thu Sep 13 21:29:15 2012 -0400

    Fix a memory leak in GtkCssStringValue

 gtk/gtkcssstringvalue.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/gtk/gtkcssstringvalue.c b/gtk/gtkcssstringvalue.c
index 78273d3..9edda64 100644
--- a/gtk/gtkcssstringvalue.c
+++ b/gtk/gtkcssstringvalue.c
@@ -29,6 +29,7 @@ struct _GtkCssValue {
 static void
 gtk_css_value_string_free (GtkCssValue *value)
 {
+  g_free (value->string);
   g_slice_free (GtkCssValue, value);
 }