geneve: Initialize addr6 with memset

Clang warns:

drivers/net/geneve.c:428:29: error: suggest braces around initialization
of subobject [-Werror,-Wmissing-braces]
                struct in6_addr addr6 = { 0 };
                                          ^
                                          {}

Rather than trying to appease the various compilers that support the
kernel, use memset, which is unambiguous.

Fixes: a0796644 ("geneve: ICMP error lookup handler")
Suggested-by: NDavid S. Miller <davem@davemloft.net>
Signed-off-by: NNathan Chancellor <natechancellor@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/geneve.c

@@ -425,7 +425,9 @@ static int geneve_udp_encap_err_lookup(struct sock *sk, struct sk_buff *skb)
 #if IS_ENABLED(CONFIG_IPV6)
 	if (geneve_get_sk_family(gs) == AF_INET6) {
 		struct ipv6hdr *ip6h = ipv6_hdr(skb);
-		struct in6_addr addr6 = { 0 };
+		struct in6_addr addr6;
+
+		memset(&addr6, 0, sizeof(struct in6_addr));
 
 		if (!gs->collect_md) {
 			vni = geneve_hdr(skb)->vni;