use the proper verb to access the 'in_cns' set

autovpn/acct.py

@@ -89,7 +89,7 @@ class Accounting(object):
         while True:
             try:
                 local_pipe.watch('in_cns')
-                input_cns = local_pipe.get('in_cns')
+                input_cns = local_pipe.smembers('in_cns')
                 local_pipe.delete('in_cns')
                 break
             except redis.WatchError: