NFSD: Clean up WRITE arg decoders

xdr_stream_subsegment() already returns a boolean value.
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>

fs/nfsd/nfs3xdr.c

@@ -571,10 +571,8 @@ nfs3svc_decode_writeargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
 		args->count = max_blocksize;
 		args->len = max_blocksize;
 	}
-	if (!xdr_stream_subsegment(xdr, &args->payload, args->count))
-		return false;
 
-	return true;
+	return xdr_stream_subsegment(xdr, &args->payload, args->count);
 }
 
 bool

fs/nfsd/nfsxdr.c

@@ -338,10 +338,8 @@ nfssvc_decode_writeargs(struct svc_rqst *rqstp, struct xdr_stream *xdr)
 		return false;
 	if (args->len > NFSSVC_MAXBLKSIZE_V2)
 		return false;
-	if (!xdr_stream_subsegment(xdr, &args->payload, args->len))
-		return false;
 
-	return true;
+	return xdr_stream_subsegment(xdr, &args->payload, args->len);
 }
 
 bool