nfs: RPC_MAX_AUTH_SIZE is in bytes

The units of RPC_MAX_AUTH_SIZE is bytes, not 4-byte words.  This causes
the client to request a larger-than-necessary session replay slot size.
Signed-off-by: NJ. Bruce Fields <bfields@redhat.com>
Signed-off-by: NTrond Myklebust <trond.myklebust@primarydata.com>

fs/nfs/nfs4xdr.c

@@ -1842,8 +1842,8 @@ static void encode_create_session(struct xdr_stream *xdr,
 	 * Assumes OPEN is the biggest non-idempotent compound.
 	 * 2 is the verifier.
 	 */
-	max_resp_sz_cached = (NFS4_dec_open_sz + RPC_REPHDRSIZE +
-			      RPC_MAX_AUTH_SIZE + 2) * XDR_UNIT;
+	max_resp_sz_cached = (NFS4_dec_open_sz + RPC_REPHDRSIZE + 2)
+				* XDR_UNIT + RPC_MAX_AUTH_SIZE;
 
 	encode_op_hdr(xdr, OP_CREATE_SESSION, decode_create_session_maxsz, hdr);
 	p = reserve_space(xdr, 16 + 2*28 + 20 + clnt->cl_nodelen + 12);