netfilter: ip6t_ipv6header: fix match on packets ending with NEXTHDR_NONE
As packets ending with NEXTHDR_NONE don't have a last extension header, the check for the length needs to be after the check for NEXTHDR_NONE. Signed-off-by: Christoph Paasch <christoph.paasch@gmail.com> Signed-off-by: Patrick McHardy <kaber@trash.net>
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