NFSv4.1: Ensure that layoutreturn uses the correct credential

We need to use the same credential as was used for the layoutget
and/or layoutcommit operations.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index a6b8db4..a8d035e 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -6452,6 +6452,7 @@
 		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
 		.rpc_argp = &lrp->args,
 		.rpc_resp = &lrp->res,
+		.rpc_cred = lrp->cred,
 	};
 	struct rpc_task_setup task_setup_data = {
 		.rpc_client = lrp->clp->cl_rpcclient,