NFSD: Replace READ* macros in nfsd4_decode_access()

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

fs/nfsd/nfs4xdr.c

@@ -439,17 +439,6 @@ nfsd4_decode_stateid(struct nfsd4_compoundargs *argp, stateid_t *sid)
 	DECODE_TAIL;
 }
 
-static __be32
-nfsd4_decode_access(struct nfsd4_compoundargs *argp, struct nfsd4_access *access)
-{
-	DECODE_HEAD;
-
-	READ_BUF(4);
-	access->ac_req_access = be32_to_cpup(p++);
-
-	DECODE_TAIL;
-}
-
 static __be32 nfsd4_decode_cb_sec(struct nfsd4_compoundargs *argp, struct nfsd4_cb_sec *cbs)
 {
 	DECODE_HEAD;
@@ -531,6 +520,19 @@ static __be32 nfsd4_decode_cb_sec(struct nfsd4_compoundargs *argp, struct nfsd4_
 	DECODE_TAIL;
 }
 
+/*
+ * NFSv4 operation argument decoders
+ */
+
+static __be32
+nfsd4_decode_access(struct nfsd4_compoundargs *argp,
+		    struct nfsd4_access *access)
+{
+	if (xdr_stream_decode_u32(argp->xdr, &access->ac_req_access) < 0)
+		return nfserr_bad_xdr;
+	return nfs_ok;
+}
+
 static __be32 nfsd4_decode_backchannel_ctl(struct nfsd4_compoundargs *argp, struct nfsd4_backchannel_ctl *bc)
 {
 	DECODE_HEAD;