tcp: use inet6_csk_route_req() in tcp_v6_send_synack()
With the recent change (earlier in this patch series) to set flowi6_oif to treq->iif in inet6_csk_route_req(), the dst lookup in these two functions is now identical, so tcp_v6_send_synack() can now just call inet6_csk_route_req(), to reduce code duplication and keep things closer to the IPv4 side, which is structured this way. Signed-off-by: NNeal Cardwell <ncardwell@google.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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