[evolution-data-server] Fix another g_propagate_error() runtime warning.

[Matthew Barnes <mbarnes src gnome org>]

commit 18839bd419cb56986c32378ff980ed083c0565ac
Author: Matthew Barnes <mbarnes redhat com>
Date:   Mon Jul 12 07:59:20 2010 -0400

    Fix another g_propagate_error() runtime warning.

 camel/camel-folder.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/camel/camel-folder.c b/camel/camel-folder.c
index ae3c21f..f5e2fc7 100644
--- a/camel/camel-folder.c
+++ b/camel/camel-folder.c
@@ -205,7 +205,7 @@ filter_filter (CamelSession *session, CamelSessionThreadMsg *tmsg)
 		}
 
 		camel_filter_driver_flush (m->driver, &local_error);
-		if (m->error == NULL)
+		if (local_error != NULL)
 			g_propagate_error (&m->error, local_error);
 
 		g_free (source_url);