net: sched: cls: add extack support for delete callback

This patch adds extack support for classifier delete callback api. This
prepares to handle extack support inside each specific classifier
implementation.

Cc: David Ahern <dsahern@gmail.com>
Signed-off-by: Alexander Aring <aring@mojatatu.com>
Acked-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/sched/cls_flower.c b/net/sched/cls_flower.c
index 8235ed9..50145b8 100644
--- a/net/sched/cls_flower.c
+++ b/net/sched/cls_flower.c
@@ -985,7 +985,8 @@
 	return err;
 }
 
-static int fl_delete(struct tcf_proto *tp, void *arg, bool *last)
+static int fl_delete(struct tcf_proto *tp, void *arg, bool *last,
+		     struct netlink_ext_ack *extack)
 {
 	struct cls_fl_head *head = rtnl_dereference(tp->root);
 	struct cls_fl_filter *f = arg;