Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/net/decnet/dn_table.c b/net/decnet/dn_table.c
index f0710b5..33fefb0 100644
--- a/net/decnet/dn_table.c
+++ b/net/decnet/dn_table.c
@@ -348,7 +348,8 @@
 		struct rtnexthop *nhp;
 		struct nlattr *mp_head;
 
-		if (!(mp_head = nla_nest_start(skb, RTA_MULTIPATH)))
+		mp_head = nla_nest_start_noflag(skb, RTA_MULTIPATH);
+		if (!mp_head)
 			goto errout;
 
 		for_nexthops(fi) {