Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/lib/raid6/recov.c b/lib/raid6/recov.c
index a95bccb..e49d519 100644
--- a/lib/raid6/recov.c
+++ b/lib/raid6/recov.c
@@ -1,13 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /* -*- linux-c -*- ------------------------------------------------------- *
  *
  *   Copyright 2002 H. Peter Anvin - All Rights Reserved
  *
- *   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, Inc., 53 Temple Place Ste 330,
- *   Boston MA 02111-1307, USA; either version 2 of the License, or
- *   (at your option) any later version; incorporated herein by reference.
- *
  * ----------------------------------------------------------------------- */
 
 /*