Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/net/mac80211/debugfs_key.c b/net/mac80211/debugfs_key.c
index a2ef95f..7b8735c 100644
--- a/net/mac80211/debugfs_key.c
+++ b/net/mac80211/debugfs_key.c
@@ -1,12 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0-only
 /*
  * Copyright 2003-2005	Devicescape Software, Inc.
  * Copyright (c) 2006	Jiri Benc <jbenc@suse.cz>
  * Copyright 2007	Johannes Berg <johannes@sipsolutions.net>
  * Copyright (C) 2015	Intel Deutschland GmbH
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
  */
 
 #include <linux/kobject.h>
@@ -342,9 +339,6 @@
 	key->debugfs.dir = debugfs_create_dir(buf,
 					key->local->debugfs.keys);
 
-	if (!key->debugfs.dir)
-		return;
-
 	sta = key->sta;
 	if (sta) {
 		sprintf(buf, "../../netdev:%s/stations/%pM",