Since we use different flags to detect tcp forwarding, and we share the same code for IPv4 and IPv6 in tcp_input, we should check both M_IP_NEXTHOP and M_IP6_NEXTHOP flags.
Since we use different flags to detect tcp forwarding, and we share the
same code for IPv4 and IPv6 in tcp_input, we should check both
M_IP_NEXTHOP and M_IP6_NEXTHOP flags.

MFC after:	3 days

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