nfsd: using nfsd4_encode_noop for encoding destroy_session/free_stateid

Get rid of the extra code, using nfsd4_encode_noop for encoding destroy_session and free_stateid.
And, delete unused argument (fr_status) int nfsd4_free_stateid.
Signed-off-by: Kinglong Mee <kinglongmee@gmail.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>

fs/nfsd/nfs4xdr.c

@@ -3500,28 +3500,6 @@ nfsd4_encode_create_session(struct nfsd4_compoundres *resp, __be32 nfserr,
 	return 0;
 }
 
-static __be32
-nfsd4_encode_destroy_session(struct nfsd4_compoundres *resp, __be32 nfserr,
-			     struct nfsd4_destroy_session *destroy_session)
-{
-	return nfserr;
-}
-
-static __be32
-nfsd4_encode_free_stateid(struct nfsd4_compoundres *resp, __be32 nfserr,
-			  struct nfsd4_free_stateid *free_stateid)
-{
-	__be32 *p;
-
-	if (nfserr)
-		return nfserr;
-
-	RESERVE_SPACE(4);
-	*p++ = nfserr;
-	ADJUST_ARGS();
-	return nfserr;
-}
-
 static __be32
 nfsd4_encode_sequence(struct nfsd4_compoundres *resp, __be32 nfserr,
 		      struct nfsd4_sequence *seq)
@@ -3620,8 +3598,8 @@ static nfsd4_enc nfsd4_enc_ops[] = {
 	[OP_BIND_CONN_TO_SESSION] = (nfsd4_enc)nfsd4_encode_bind_conn_to_session,
 	[OP_EXCHANGE_ID]	= (nfsd4_enc)nfsd4_encode_exchange_id,
 	[OP_CREATE_SESSION]	= (nfsd4_enc)nfsd4_encode_create_session,
-	[OP_DESTROY_SESSION]	= (nfsd4_enc)nfsd4_encode_destroy_session,
-	[OP_FREE_STATEID]	= (nfsd4_enc)nfsd4_encode_free_stateid,
+	[OP_DESTROY_SESSION]	= (nfsd4_enc)nfsd4_encode_noop,
+	[OP_FREE_STATEID]	= (nfsd4_enc)nfsd4_encode_noop,
 	[OP_GET_DIR_DELEGATION]	= (nfsd4_enc)nfsd4_encode_noop,
 	[OP_GETDEVICEINFO]	= (nfsd4_enc)nfsd4_encode_noop,
 	[OP_GETDEVICELIST]	= (nfsd4_enc)nfsd4_encode_noop,

fs/nfsd/xdr4.h

@@ -374,7 +374,6 @@ struct nfsd4_test_stateid {
 
 struct nfsd4_free_stateid {
 	stateid_t	fr_stateid;         /* request */
-	__be32		fr_status;          /* response */
 };
 
 /* also used for NVERIFY */