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neigh: check error pointer instead of NULL for ipv4_neigh_lookup()
Fixes: commit f187bc6 ("ipv4: No need to set generic neighbour pointer") Cc: David S. Miller <davem@davemloft.net> Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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