[gvfs] Avoid crash when printf function is called with a NULL string. Fixes

[Brian Cameron <bcameron src gnome org>]

commit cd99d7d11fef5488cdd1e8b96829459dd2afad15
Author: Brian Cameron <Brian Cameron sun com>
Date:   Fri Oct 9 10:48:58 2009 -0500

    Avoid crash when printf function is called with a NULL string.  Fixes
    bug #580825.

 daemon/gvfsbackendsmbbrowse.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/daemon/gvfsbackendsmbbrowse.c b/daemon/gvfsbackendsmbbrowse.c
index 2eebdd2..23b9938 100644
--- a/daemon/gvfsbackendsmbbrowse.c
+++ b/daemon/gvfsbackendsmbbrowse.c
@@ -1494,7 +1494,7 @@ g_vfs_backend_smb_browse_class_init (GVfsBackendSmbBrowseClass *klass)
     }
 #endif
 
-  DEBUG ("g_vfs_backend_smb_browse_class_init - default workgroup = '%s'\n", default_workgroup);
+  DEBUG ("g_vfs_backend_smb_browse_class_init - default workgroup = '%s'\n", default_workgroup ? default_workgroup : "NULL");
 }
 
 void