Fix typo, as suggested by Stefan Berger.

Signed-off-by: Ewan Mellor <ewan@xensource.com>

tools/python/xen/xend/XendDomainInfo.py

@@ -2125,7 +2125,7 @@ class XendDomainInfo:
                 config['mode'] = 'RW'
 
         if dev_class == 'vtpm':
-            if not config.has_type('type'):
+            if not config.has_key('type'):
                 config['type'] = 'paravirtualised' # TODO
             if not config.has_key('backend'):
                 config['backend'] = "00000000-0000-0000-0000-000000000000"