audit: remove useless synchronize_net()
netlink kernel socket is protected by refcount, not RCU. Its rcv path is neither protected by RCU. So the synchronize_net() is just pointless. Cc: Richard Guy Briggs <rgb@redhat.com> Signed-off-by: NCong Wang <xiyou.wangcong@gmail.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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