[gvfs] metatree: Don't g_warning if the running gvfs daemon is older

[Alexander Larsson <alexl src gnome org>]

commit 55761f269eb43f289cd005ff54d8b808301762ad
Author: Alexander Larsson <alexl redhat com>
Date:   Mon Jun 8 11:43:08 2015 +0200

    metatree: Don't g_warning if the running gvfs daemon is older
    
    This was breaking the build for me due to warnings-as-errors

 metadata/metatree.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/metadata/metatree.c b/metadata/metatree.c
index 59be3df..89942cb 100644
--- a/metadata/metatree.c
+++ b/metadata/metatree.c
@@ -2859,7 +2859,8 @@ get_tree_for_device (MetaLookupCache *cache,
 
       if (error)
         {
-          g_warning ("Error: %s\n", error->message);
+         if (!g_error_matches (error, G_DBUS_ERROR, G_DBUS_ERROR_UNKNOWN_METHOD))
+           g_warning ("Error: %s\n", error->message);
           g_error_free (error);
         }