net: sched: Move offload check till after dump call

Move the check of the offload state to after the qdisc dump action was
called, so the qdisc could update it if it was changed.

Fixes: 7a4fa291

 ("net: sched: Add TCA_HW_OFFLOAD")
Signed-off-by: Nogah Frankel <nogahf@mellanox.com>
Reviewed-by: Yuval Mintz <yuvalm@mellanox.com>
Acked-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>