Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/net/netrom/nr_out.c b/net/netrom/nr_out.c
index 00fbf14..4492965 100644
--- a/net/netrom/nr_out.c
+++ b/net/netrom/nr_out.c
@@ -1,8 +1,5 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
- * 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.
  *
  * Copyright Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk)
  * Copyright Darryl Miles G7LED (dlm@g7led.demon.co.uk)