[gnome-software] shell overview: Fix a possible double free in dispose

[Kalev Lember <klember src gnome org>]

commit 131ee2ed036df16cf98a7a1bf2dc0123f0b65611
Author: Kalev Lember <klember redhat com>
Date:   Fri Jun 26 21:32:57 2015 +0200

    shell overview: Fix a possible double free in dispose

 src/gs-shell-overview.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/src/gs-shell-overview.c b/src/gs-shell-overview.c
index 2e1088a..37c8908 100644
--- a/src/gs-shell-overview.c
+++ b/src/gs-shell-overview.c
@@ -546,7 +546,7 @@ gs_shell_overview_dispose (GObject *object)
        g_clear_object (&priv->builder);
        g_clear_object (&priv->plugin_loader);
        g_clear_object (&priv->cancellable);
-       g_free (priv->category_of_day);
+       g_clear_pointer (&priv->category_of_day, g_free);
 
        G_OBJECT_CLASS (gs_shell_overview_parent_class)->dispose (object);
 }