As it has to happen before pktsched_init, that is called from
net_dev_init that is a subsys_initcall, making it the same
init level as netlink_proto_init, that ends up being called
_after_ net_dev_init, so when pktsched_init is called it finds
rtnetlink_links[PF_UNSPEC] as null and therefore not sets
the ->dumpit entry for RTM_GETQDISC (and the others too):
b00m, rtnetlink_rcv sends a failure message to tc.