SUNRPC: Convert rpc_clnt->cl_users to a kref

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
diff --git a/include/linux/sunrpc/clnt.h b/include/linux/sunrpc/clnt.h
index 2f4b520..003d8ea 100644
--- a/include/linux/sunrpc/clnt.h
+++ b/include/linux/sunrpc/clnt.h
@@ -24,8 +24,8 @@
  * The high-level client handle
  */
 struct rpc_clnt {
+	struct kref		cl_kref;	/* Number of references */
 	atomic_t		cl_count;	/* Number of clones */
-	atomic_t		cl_users;	/* number of references */
 	struct list_head	cl_clients;	/* Global list of clients */
 	struct list_head	cl_tasks;	/* List of tasks */
 	spinlock_t		cl_lock;	/* spinlock */