[gvfs] metadata: return if meta_tree_refresh failed

[Ondrej Holy <oholy src gnome org>]

commit 56326e463a56afa0e632baad4c94faa7aa154486
Author: Ondrej Holy <oholy redhat com>
Date:   Fri Feb 20 17:33:56 2015 +0100

    metadata: return if meta_tree_refresh failed
    
    G_UNLOCK is called twice if meta_tree_refresh fails and also concurrent
    access is possible on cached_trees. However this isn't problem currently,
    because meta_tree_lookup_by_name is always called with for_write=FALSE
    (except for meta-set testing utility), so this if statement is never issued.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=598561

 metadata/metatree.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/metadata/metatree.c b/metadata/metatree.c
index 2983e5d..0fe29a1 100644
--- a/metadata/metatree.c
+++ b/metadata/metatree.c
@@ -547,7 +547,7 @@ meta_tree_lookup_by_name (const char *name,
         return tree;
 
       meta_tree_unref (tree);
-      tree = NULL;
+      return NULL;
     }
 
   filename = g_build_filename (g_get_user_data_dir (), "gvfs-metadata", name, NULL);