netfilter: nft_tproxy: Fix missing-braces warning

This patch fixes a warning reported by the kbuild test robot (from linux-next
tree):
   net/netfilter/nft_tproxy.c: In function 'nft_tproxy_eval_v6':
>> net/netfilter/nft_tproxy.c:85:9: warning: missing braces around initializer [-Wmissing-braces]
     struct in6_addr taddr = {0};
            ^
   net/netfilter/nft_tproxy.c:85:9: warning: (near initialization for 'taddr.in6_u') [-Wmissing-braces]

This warning is actually caused by a gcc bug already resolved in newer
versions (kbuild used 4.9) so this kind of initialization is omitted and
memset is used instead.

Fixes: 4ed8eb6570a4 ("netfilter: nf_tables: Add native tproxy support")
Signed-off-by: Máté Eckl <ecklm94@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

net/netfilter/nft_tproxy.c

@@ -82,13 +82,15 @@ static void nft_tproxy_eval_v6(const struct nft_expr *expr,
 	const struct nft_tproxy *priv = nft_expr_priv(expr);
 	struct sk_buff *skb = pkt->skb;
 	const struct ipv6hdr *iph = ipv6_hdr(skb);
-	struct in6_addr taddr = {0};
+	struct in6_addr taddr;
 	int thoff = pkt->xt.thoff;
 	struct udphdr _hdr, *hp;
 	__be16 tport = 0;
 	struct sock *sk;
 	int l4proto;
 
+	memset(&taddr, 0, sizeof(taddr));
+
 	if (!pkt->tprot_set) {
 		regs->verdict.code = NFT_BREAK;
 		return;