xend: modify sort() for Python 2.3

Python 2.3 does not support the sort(cmp, key, reverse) style.

Signed-off-by: KUWAMURA Shin'ya <kuwa@jp.fujitsu.com>
Acked-by: Ian Jackson <ian.jackson@eu.citrix.com>

tools/python/xen/util/pci.py

@@ -310,7 +310,7 @@ def parse_pci_name_extended(pci_dev_str):
     # By arranging things so that virtual function 0 is first,
     # attachemnt can use the returned list as is. And detachment
     # can just reverse the list.
-    pci.sort(None, lambda x: int(x['vdevfn'], 16), 1)
+    pci.sort(lambda x,y: cmp(int(y['vdevfn'], 16), int(x['vdevfn'], 16)))
     return pci
 
 def parse_pci_name(pci_name_string):