net: sched: cls_api: Fix the the wrong parameter

stable inclusion
from linux-4.19.199
commit d682390655b388f7eb69add0006a4fce9cc33b3a

--------------------------------

[ Upstream commit 9d85a6f4 ]

The 4th parameter in tc_chain_notify() should be flags rather than seq.
Let's change it back correctly.

Fixes: 32a4f5ec ("net: sched: introduce chain object to uapi")
Signed-off-by: NYajun Deng <yajun.deng@linux.dev>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
Signed-off-by: NSasha Levin <sashal@kernel.org>
Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>

net/sched/cls_api.c

@@ -1918,7 +1918,7 @@ static int tc_ctl_chain(struct sk_buff *skb, struct nlmsghdr *n,
 		break;
 	case RTM_GETCHAIN:
 		err = tc_chain_notify(chain, skb, n->nlmsg_seq,
-				      n->nlmsg_seq, n->nlmsg_type, true);
+				      n->nlmsg_flags, n->nlmsg_type, true);
 		if (err < 0)
 			NL_SET_ERR_MSG(extack, "Failed to send chain notify message");
 		break;