xend: fix an undefined name error: mac may be referenced before definition.

Signed-off-by: Zhigang Wang <zhigang.x.wang@oracle.com>

diff --git a/tools/python/xen/xend/XendDomainInfo.py b/tools/python/xen/xend/XendDomainInfo.py
index bb7bd72c1fa7a69149714450d4638128249fc040..40b81cf1ac7babfeb1ea25db446e40516b70e38c 100644 (file)
--- a/tools/python/xen/xend/XendDomainInfo.py
+++ b/tools/python/xen/xend/XendDomainInfo.py
@@ -1230,6 +1230,7 @@ class XendDomainInfo:
         if rm_cfg:
             if deviceClass == 'vif':
                 if self.domid is not None:
+                    mac = ''
                     for dev_num, dev_info in sxprs:
                         dev_num = int(dev_num)
                         if dev_num == dev: