Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/ipc/mq_sysctl.c b/ipc/mq_sysctl.c
index 68d4e95..7c00f28 100644
--- a/ipc/mq_sysctl.c
+++ b/ipc/mq_sysctl.c
@@ -1,12 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-only
 /*
  *  Copyright (C) 2007 IBM Corporation
  *
  *  Author: Cedric Le Goater <clg@fr.ibm.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, version 2 of the
- *  License.
  */
 
 #include <linux/nsproxy.h>