net_sched: no need to free qdisc in RCU callback
gen estimator has been rewritten in commit 1c0d32fd ("net_sched: gen_estimator: complete rewrite of rate estimators"), the caller no longer needs to wait for a grace period. So this patch gets rid of it. Cc: Jamal Hadi Salim <jhs@mojatatu.com> Cc: Eric Dumazet <edumazet@google.com> Signed-off-by: NCong Wang <xiyou.wangcong@gmail.com> Acked-by: NEric Dumazet <edumazet@google.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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