netfilter: nf_tables_arp: don't set forward chain

46928a0b49f3 ("netfilter: nf_tables: remove multihook chains and
families") already removed this, this is a leftover.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

net/ipv4/netfilter/nf_tables_arp.c

@@ -34,7 +34,6 @@ static struct nft_af_info nft_af_arp __read_mostly = {
 	.hooks		= {
 		[NF_ARP_IN]		= nft_do_chain_arp,
 		[NF_ARP_OUT]		= nft_do_chain_arp,
-		[NF_ARP_FORWARD]	= nft_do_chain_arp,
 	},
 };