net_sched: fix regression in tc_action_ops
list_for_each_entry(a, &act_base, head) doesn't exit with a = NULL if we reached the end of the list. tcf_unregister_action(), tc_lookup_action_n() and tc_lookup_action() need fixes. Remove tc_lookup_action_id() as its unused and not worth 'fixing' Signed-off-by: NEric Dumazet <edumazet@google.com> Fixes: 1f747c26 ("net_sched: convert tc_action_ops to use struct list_head") Cc: Cong Wang <xiyou.wangcong@gmail.com> Reviewed-by: NCong Wang <xiyou.wangcong@gmail.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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