nfsd4: Use FIRST_NFS4_OP in nfsd4_decode_compound()

Since we're checking for LAST_NFS4_OP, use FIRST_NFS4_OP to be consistent.
Signed-off-by: NRicardo Labiaga <Ricardo.Labiaga@netapp.com>
Signed-off-by: NJ. Bruce Fields <bfields@citi.umich.edu>

fs/nfsd/nfs4xdr.c

@@ -1434,7 +1434,7 @@ nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
 		}
 		op->opnum = ntohl(*argp->p++);
 
-		if (op->opnum >= OP_ACCESS && op->opnum <= LAST_NFS4_OP)
+		if (op->opnum >= FIRST_NFS4_OP && op->opnum <= LAST_NFS4_OP)
 			op->status = ops->decoders[op->opnum](argp, &op->u);
 		else {
 			op->opnum = OP_ILLEGAL;