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_hhf.c b/net/sched/sch_hhf.c
index 73a53c0..b3a80f0 100644
--- a/net/sched/sch_hhf.c
+++ b/net/sched/sch_hhf.c
@@ -571,7 +571,8 @@ static int hhf_change(struct Qdisc *sch, struct nlattr *opt)
 	return 0;
 }
 
-static int hhf_init(struct Qdisc *sch, struct nlattr *opt)
+static int hhf_init(struct Qdisc *sch, struct nlattr *opt,
+		    struct netlink_ext_ack *extack)
 {
 	struct hhf_sched_data *q = qdisc_priv(sch);
 	int i;