net: sched: sch: add extack for init callback

This patch adds extack support for init callback to prepare per-qdisc
specific changes for extack.

Cc: David Ahern <dsahern@gmail.com>
Acked-by: Jamal Hadi Salim <jhs@mojatatu.com>
Signed-off-by: Alexander Aring <aring@mojatatu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/sched/sch_mq.c b/net/sched/sch_mq.c
index 8cbb5c8..b91f7d8 100644
--- a/net/sched/sch_mq.c
+++ b/net/sched/sch_mq.c
@@ -36,7 +36,8 @@ static void mq_destroy(struct Qdisc *sch)
 	kfree(priv->qdiscs);
 }
 
-static int mq_init(struct Qdisc *sch, struct nlattr *opt)
+static int mq_init(struct Qdisc *sch, struct nlattr *opt,
+		   struct netlink_ext_ack *extack)
 {
 	struct net_device *dev = qdisc_dev(sch);
 	struct mq_sched *priv = qdisc_priv(sch);