SUNRPC: Add an identifier for struct rpc_clnt

Add an identifier in order to aid debugging.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
diff --git a/include/linux/sunrpc/clnt.h b/include/linux/sunrpc/clnt.h
index 76c0bf6..6740801 100644
--- a/include/linux/sunrpc/clnt.h
+++ b/include/linux/sunrpc/clnt.h
@@ -33,6 +33,7 @@
  */
 struct rpc_clnt {
 	atomic_t		cl_count;	/* Number of references */
+	unsigned int		cl_clid;	/* client id */
 	struct list_head	cl_clients;	/* Global list of clients */
 	struct list_head	cl_tasks;	/* List of tasks */
 	spinlock_t		cl_lock;	/* spinlock */