Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/drivers/net/arcnet/capmode.c b/drivers/net/arcnet/capmode.c
index b780be6..c09b567 100644
--- a/drivers/net/arcnet/capmode.c
+++ b/drivers/net/arcnet/capmode.c
@@ -44,7 +44,7 @@
 {
 	struct arcnet_local *lp = netdev_priv(dev);
 	struct sk_buff *skb;
-	struct archdr *pkt = pkthdr;
+	struct archdr *pkt;
 	char *pktbuf, *pkthdrbuf;
 	int ofs;