rtnetlink: Update comment in rtnl_stats_dump regarding strict data checking

The NLM_F_DUMP_PROPER_HDR netlink flag was replaced by a setsockopt.
Update the comment in rtnl_stats_dump.

Fixes: 841891ec ("rtnetlink: Update rtnl_stats_dump for strict data checking")
Reported-by: Christian Brauner <christian@brauner.io>
Signed-off-by: David Ahern <dsahern@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/core/rtnetlink.c

@@ -4777,8 +4777,8 @@ static int rtnl_stats_dump(struct sk_buff *skb, struct netlink_callback *cb)
 
 	ifsm = nlmsg_data(cb->nlh);
 
-	/* only requests using NLM_F_DUMP_PROPER_HDR can pass data to
-	 * influence the dump. The legacy exception is filter_mask.
+	/* only requests using strict checks can pass data to influence
+	 * the dump. The legacy exception is filter_mask.
 	 */
 	if (cb->strict_check) {
 		if (ifsm->pad1 || ifsm->pad2 || ifsm->ifindex) {