xfrm: interface: do not confirm neighbor when do pmtu update
When do IPv6 tunnel PMTU update and calls __ip6_rt_update_pmtu() in the end, we should not call dst_confirm_neigh() as there is no two-way communication. Signed-off-by: NXu Wang <vulab@iscas.ac.cn> Signed-off-by: NSteffen Klassert <steffen.klassert@secunet.com>
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