Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/security/keys/gc.c b/security/keys/gc.c
index 7207e60..671dd73 100644
--- a/security/keys/gc.c
+++ b/security/keys/gc.c
@@ -1,15 +1,10 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* Key garbage collector
  *
  * Copyright (C) 2009-2011 Red Hat, Inc. All Rights Reserved.
  * Written by David Howells (dhowells@redhat.com)
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public Licence
- * as published by the Free Software Foundation; either version
- * 2 of the Licence, or (at your option) any later version.
  */
 
-#include <linux/module.h>
 #include <linux/slab.h>
 #include <linux/security.h>
 #include <keys/keyring-type.h>
@@ -155,7 +150,7 @@
 			atomic_dec(&key->user->nikeys);
 
 		key_user_put(key->user);
-
+		key_put_tag(key->domain_tag);
 		kfree(key->description);
 
 		memzero_explicit(key, sizeof(*key));