Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/arch/mips/ralink/bootrom.c b/arch/mips/ralink/bootrom.c
index e1fa597..88bcce5 100644
--- a/arch/mips/ralink/bootrom.c
+++ b/arch/mips/ralink/bootrom.c
@@ -1,7 +1,5 @@
+// SPDX-License-Identifier: GPL-2.0-only
 /*
- * 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.
  *
  * Copyright (C) 2013 John Crispin <john@phrozen.org>
  */
@@ -35,13 +33,7 @@
 
 static int bootrom_setup(void)
 {
-	if (!debugfs_create_file("bootrom", 0444,
-			NULL, NULL, &bootrom_file_ops)) {
-		pr_err("Failed to create bootrom debugfs file\n");
-
-		return -EINVAL;
-	}
-
+	debugfs_create_file("bootrom", 0444, NULL, NULL, &bootrom_file_ops);
 	return 0;
 }