fib: remove a useless synchronize_rcu() call
fib_nl_delrule() calls synchronize_rcu() for no apparent reason, while rtnl is held. I suspect it was done to avoid an atomic_inc_not_zero() in fib_rules_lookup(), which commit 7fa7cb71 added anyway. Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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