Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/drivers/input/keyboard/mcs_touchkey.c b/drivers/input/keyboard/mcs_touchkey.c
index be56d4f..8cb0062 100644
--- a/drivers/input/keyboard/mcs_touchkey.c
+++ b/drivers/input/keyboard/mcs_touchkey.c
@@ -1,14 +1,10 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Touchkey driver for MELFAS MCS5000/5080 controller
  *
  * Copyright (C) 2010 Samsung Electronics Co.Ltd
  * Author: HeungJun Kim <riverful.kim@samsung.com>
  * Author: Joonyoung Shim <jy0922.shim@samsung.com>
- *
- * This program is free software; you can redistribute  it and/or modify it
- * under  the terms of  the GNU General  Public License as published by the
- * Free Software Foundation;  either version 2 of the  License, or (at your
- * option) any later version.
  */
 
 #include <linux/module.h>
@@ -113,9 +109,8 @@
 		return -EINVAL;
 	}
 
-	data = kzalloc(sizeof(struct mcs_touchkey_data) +
-			sizeof(data->keycodes[0]) * (pdata->key_maxval + 1),
-			GFP_KERNEL);
+	data = kzalloc(struct_size(data, keycodes, pdata->key_maxval + 1),
+		       GFP_KERNEL);
 	input_dev = input_allocate_device();
 	if (!data || !input_dev) {
 		dev_err(&client->dev, "Failed to allocate memory\n");