Issue-40.  Fix assert in message_types bad ver
diff --git a/tests/message_types.py b/tests/message_types.py
index 7785f36..fe19f61 100644
--- a/tests/message_types.py
+++ b/tests/message_types.py
@@ -107,8 +107,8 @@
                                'Switch did not reply with error message')
         self.assertTrue(response.type==ofp.OFPET_BAD_REQUEST, 
                                'Message field type is not OFPET_BAD_REQUEST') 
-        self.assertTrue(response.type==ofp.OFPET_BAD_REQUEST, 
-                               'Message field code is not OFPBRC_BAD_VERSION')
+        self.assertTrue(response.code==ofp.OFPBRC_BAD_VERSION,
+                        'Message field code is not OFPBRC_BAD_VERSION')
 
 
 @group('smoke')