Typo correction

contrib/vpn_acct.py

@@ -34,7 +34,7 @@ def read_vpn_acct_file(filename):
         # format: username ip qos uptxbytes downrxbytes
         if len(d) == 5:
             metrics.extend([
-                ( '%s.%s.upxtbytes'   % (options.prefix, d[0]), (tstamp, int(d[3])) ),
+                ( '%s.%s.uptxbytes'   % (options.prefix, d[0]), (tstamp, int(d[3])) ),
                 ( '%s.%s.downrxbytes' % (options.prefix, d[0]), (tstamp, int(d[4])) ),
             ])
     return tstamp, metrics