[dconf/wip/reorg] dconf_changeset_get: allow NULL value out argument

[Ryan Lortie <ryanl src gnome org>]

commit a20d8fa3133eadf11a3db9d9ad1761e02bb20d41
Author: Ryan Lortie <desrt desrt ca>
Date:   Fri Jul 6 16:37:47 2012 -0400

    dconf_changeset_get: allow NULL value out argument
    
    We may be interested in only checking the return value for if a key
    exists or not.

 common/dconf-changeset.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)
---
diff --git a/common/dconf-changeset.c b/common/dconf-changeset.c
index 481a82e..261d4ff 100644
--- a/common/dconf-changeset.c
+++ b/common/dconf-changeset.c
@@ -141,7 +141,9 @@ dconf_changeset_get (DConfChangeset  *change,
   if (!g_hash_table_lookup_extended (change->table, key, NULL, &tmp))
     return FALSE;
 
-  *value = tmp ? g_variant_ref (tmp) : NULL;
+  if (value)
+    *value = tmp ? g_variant_ref (tmp) : NULL;
+
   return TRUE;
 }