net/neighbour: fix crash at dumping device-agnostic proxy entries
[ Upstream commit 6adc5fd6 ] Proxy entries could have null pointer to net-device. Signed-off-by: Konstantin Khlebnikov <koct9i@gmail.com> Fixes: 84920c14 ("net: Allow ipv6 proxies and arp proxies be shown with iproute2") Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
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