tools/python: fix TypeError for 17903:0728459b3c8d

If `hda' is used in domU config file and domain-0 has /dev/hda,
creating a domain failed by TypeError:

  File "//usr/lib/python/xen/xend/server/blkif.py", line 84, in
getDeviceDetails
    (device_path, devid) = blkif.blkdev_name_to_number(dev)
TypeError: unpack non-sequence

Signed-off-by: KUWAMURA Shin'ya <kuwa@jp.fujitsu.com>

tools/python/xen/util/blkif.py

@@ -20,7 +20,7 @@ def blkdev_name_to_number(name):
     devnum = None
 
     try:
-        return os.stat(n).st_rdev
+        return (devname, os.stat(n).st_rdev)
     except Exception, ex:
         pass