[PATCH v1 net-next] geneve: Move udp_conf.local_ip6 under CONFIG_IPV6 in geneve_create_sock().

[Kuniyuki Iwashima <kuniyu@google.com>]

Unlike struct ip_tunnel_key, struct udp_port_cfg does not always
define IPv6 address fields.

  >> drivers/net/geneve.c:778:12: error: no member named 'local_ip6' in 'struct udp_port_cfg'
       778 |                 udp_conf.local_ip6 = info->key.u.ipv6.src;
           |                 ~~~~~~~~ ^

Let's add CONFIG_IPV6 guard in geneve_create_sock().

Fixes: afabbb56a726 ("geneve: Introduce IFLA_GENEVE_LOCAL and IFLA_GENEVE_LOCAL6.")
Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202606070019.yx2LhZPU-lkp@intel.com/
Signed-off-by: Kuniyuki Iwashima <kuniyu@google.com>
---
 drivers/net/geneve.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/net/geneve.c b/drivers/net/geneve.c
index a60e16bbb2c9..23b42466a7c9 100644
--- a/drivers/net/geneve.c
+++ b/drivers/net/geneve.c
@@ -771,12 +771,15 @@ static struct sock *geneve_create_sock(struct net *net,
 
 	memset(&udp_conf, 0, sizeof(udp_conf));
 
+#if IS_ENABLED(CONFIG_IPV6)
 	if (ipv6) {
 		udp_conf.family = AF_INET6;
 		udp_conf.ipv6_v6only = 1;
 		udp_conf.use_udp6_rx_checksums = geneve->cfg.use_udp6_rx_checksums;
 		udp_conf.local_ip6 = info->key.u.ipv6.src;
-	} else {
+	} else
+#endif
+	{
 		udp_conf.family = AF_INET;
 		udp_conf.local_ip.s_addr = info->key.u.ipv4.src;
 	}
-- 
2.54.0.1032.g2f8565e1d1-goog