[pitivi] Fix a NameError introduced in the previous commit.

[Edward Hervey <edwardrv src gnome org>]

commit 8b4f8658c7ab91b23a01f146da4680af9622c479
Author: Alessandro Decina <alessandro d gmail com>
Date:   Fri Jun 5 19:11:07 2009 +0200

    Fix a NameError introduced in the previous commit.
---
 pitivi/formatters/etree.py |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/pitivi/formatters/etree.py b/pitivi/formatters/etree.py
index da85d60..ad443b9 100644
--- a/pitivi/formatters/etree.py
+++ b/pitivi/formatters/etree.py
@@ -630,7 +630,7 @@ class ElementTreeFormatter(Formatter):
 
     def _discovererDiscoveryErrorCb(self, discoverer, uri, error, detail,
             project, sources, uris, closure):
-        if factory.uri not in uris:
+        if uri not in uris:
             # someone else is using discoverer, this signal isn't for us
             return