pkt_sched: Protect gen estimators under est_lock.
gen_kill_estimator() required rtnl_lock() protection, but since it is moved to an RCU callback __qdisc_destroy() let's use est_lock instead. Signed-off-by: Jarek Poplawski <jarkao2@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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