[XM] Fix rmlabel filename assignment

The patch fixes a bug in the rmlabel tool.

Signed-off-by: Stefan Berger <stefanb@us.ibm.com>

tools/python/xen/xm/rmlabel.py

@@ -57,7 +57,8 @@ def rm_domain_label(configfile):
     fd = None
     file = None
     if configfile[0] == '/':
-        fd = open(configfile, "rb")
+        file = configfile
+        fd = open(file, "rb")
     else:
         for prefix in [".", "/etc/xen"]:
             file = prefix + "/" + configfile