net/sched: sch_ingress: Only create under TC_H_INGRESS

net/sched: sch_ingress: Only create under TC_H_INGRESS

ingress Qdiscs are only supposed to be created under TC_H_INGRESS.
Return -EOPNOTSUPP if 'parent' is not TC_H_INGRESS, similar to
mq_init().

Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Reported-by: [email protected]
Closes: https://lore.kernel.org/r/[email protected]/
Tested-by: Pedro Tammela <[email protected]>
Acked-by: Jamal Hadi Salim <[email protected]>
Reviewed-by: Jamal Hadi Salim <[email protected]>
Reviewed-by: Vlad Buslov <[email protected]>
Signed-off-by: Peilin Ye <[email protected]>
Signed-off-by: Jakub Kicinski <[email protected]>