[gegl/xml] xml2: don't serialize output proxy

[Michael Murà <mmure src gnome org>]

commit 9b4c8fd7470079eda99c330679af11029d4131da
Author: Michael Murà <mure michael gmail com>
Date:   Sat Jul 28 12:40:27 2012 +0900

    xml2: don't serialize output proxy

 gegl/gegl-xml-v2.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/gegl/gegl-xml-v2.c b/gegl/gegl-xml-v2.c
index 092af11..343a35a 100644
--- a/gegl/gegl-xml-v2.c
+++ b/gegl/gegl-xml-v2.c
@@ -780,7 +780,9 @@ gegl_node_to_xml_v2 (GeglNode    *gegl,
   ss.nodes       = g_hash_table_new (NULL, NULL);
   ss.counter     = 0;
 
+  /* Make sure we don't serialize a proxy. */
   gegl = gegl_node_get_output_proxy (gegl, "output");
+  gegl = gegl_node_get_producer (gegl, "input", NULL);
 
   g_string_append (ss.buf, "<?xml version='1.0' encoding='UTF-8'?>\n");
   g_string_append (ss.buf, "<gegl>\n");