Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/drivers/dio/Makefile b/drivers/dio/Makefile
index ae92d17..11202f2 100644
--- a/drivers/dio/Makefile
+++ b/drivers/dio/Makefile
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0-only
 #
 # Makefile for the linux kernel.
 #
diff --git a/drivers/dio/dio.c b/drivers/dio/dio.c
index 92e78d1..c9aa15f 100644
--- a/drivers/dio/dio.c
+++ b/drivers/dio/dio.c
@@ -89,8 +89,8 @@
 #undef DIONAME
 #undef DIOFBNAME
 
-static const char *unknowndioname 
-        = "unknown DIO board -- please email <linux-m68k@lists.linux-m68k.org>!";
+static const char unknowndioname[]
+	= "unknown DIO board, please email linux-m68k@lists.linux-m68k.org";
 
 static const char *dio_getname(int id)
 {