net/sched: act_api: fix miss set post_ct for ovs after do conntrack in act_ct

When openvswitch conntrack offload with act_ct action. The first rule
do conntrack in the act_ct in tc subsystem. And miss the next rule in
the tc and fallback to the ovs datapath but miss set post_ct flag
which will lead the ct_state_key with -trk flag.

Fixes: 7baf2429a1 ("net/sched: cls_flower add CT_FLAGS_INVALID flag support")
Signed-off-by: wenxu <wenxu@ucloud.cn>
Reviewed-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/sched/cls_api.c

@@ -1629,6 +1629,7 @@ int tcf_classify_ingress(struct sk_buff *skb,
 			return TC_ACT_SHOT;
 		ext->chain = last_executed_chain;
 		ext->mru = qdisc_skb_cb(skb)->mru;
+		ext->post_ct = qdisc_skb_cb(skb)->post_ct;
 	}
 
 	return ret;