[glib] Fix the dbus action group query_action implementation

[Ryan Lortie <ryanl src gnome org>]

commit 7ef3e27255d66af428f046b58281d4402a045b54
Author: Matthias Clasen <mclasen redhat com>
Date:   Mon Nov 28 18:12:17 2011 -0500

    Fix the dbus action group query_action implementation

 gio/gdbusactiongroup.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/gio/gdbusactiongroup.c b/gio/gdbusactiongroup.c
index b0e1116..24c5fad 100644
--- a/gio/gdbusactiongroup.c
+++ b/gio/gdbusactiongroup.c
@@ -184,7 +184,7 @@ g_dbus_action_group_query_action (GActionGroup        *g_group,
     *state_hint = NULL;
 
   if (state)
-    *state = g_variant_ref (info->state);
+    *state = info->state ? g_variant_ref (info->state) : NULL;
 
   return TRUE;
 }