[gvfs] Don't call get_devnum on NULL

[Alexander Larsson <alexl src gnome org>]

commit 3618e00eb921f8d288f57461f0dc7ece5704589b
Author: Alexander Larsson <alexl redhat com>
Date:   Mon Sep 7 13:05:52 2009 +0200

    Don't call get_devnum on NULL

 metadata/metatree.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/metadata/metatree.c b/metadata/metatree.c
index 67c29a6..38c7d45 100644
--- a/metadata/metatree.c
+++ b/metadata/metatree.c
@@ -3087,7 +3087,8 @@ find_mountpoint_for (MetaLookupCache *cache,
   last = g_strdup (file);
   while (1)
     {
-      dir_dev = get_devnum (dir);
+      if (dir)
+	dir_dev = get_devnum (dir);
       if (dir == NULL ||
 	  dev != dir_dev)
 	{