ip_vti: Fix unused variable warning
If CONFIG_INET_XFRM_TUNNEL is set but CONFIG_IPV6 is n, net/ipv4/ip_vti.c:493:27: warning: 'vti_ipip6_handler' defined but not used [-Wunused-variable] Signed-off-by: YueHaibing <yuehaibing@huawei.com> Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
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