NFSD: Replace READ* macros that decode the fattr4 size attribute

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

fs/nfsd/nfs4xdr.c

@@ -273,8 +273,11 @@ nfsd4_decode_fattr(struct nfsd4_compoundargs *argp, u32 *bmval,
 	starting_pos = xdr_stream_pos(argp->xdr);
 
 	if (bmval[0] & FATTR4_WORD0_SIZE) {
-		READ_BUF(8);
-		p = xdr_decode_hyper(p, &iattr->ia_size);
+		u64 size;
+
+		if (xdr_stream_decode_u64(argp->xdr, &size) < 0)
+			return nfserr_bad_xdr;
+		iattr->ia_size = size;
 		iattr->ia_valid |= ATTR_SIZE;
 	}
 	if (bmval[0] & FATTR4_WORD0_ACL) {