a typo error was introtucted

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@1197 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5SyncML/XMLSyncUtils.py

@@ -223,7 +223,7 @@ class XMLSyncUtilsMixin(SyncCode):
     elif hasattr(object,'manage_FTPget'):
       xml_method = getattr(object,'manage_FTPget')
     if xml_method is not None:
-      xml += xml_method()
+      xml = xml_method()
     return xml
 
   def getSessionId(self, xml):