lockd: Don't bother with RPC ping for NSM upcalls

Cut NSM upcall RPC traffic in half -- don't do a NULL call first.
The cases where a ping would be helpful are rare.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

fs/lockd/mon.c

diff --git a/fs/lockd/mon.c b/fs/lockd/mon.c
index 3838533..7fce1b5 100644
--- a/fs/lockd/mon.c
+++ b/fs/lockd/mon.c
@@ -112,6 +112,7 @@
 		.program		= &nsm_program,
 		.version		= NSM_VERSION,
 		.authflavor		= RPC_AUTH_NULL,
+		.flags			= RPC_CLNT_CREATE_NOPING,
 	};
 
 	return rpc_create(&args);