sch_hfsc: make hfsc_qlen_notify() idempotent

In the Linux kernel, the following vulnerability has been resolved:

sch_hfsc: make hfsc_qlen_notify() idempotent

hfsc_qlen_notify() is not idempotent either and not friendly

to its callers, like fq_codel_dequeue(). Let's make it idempotent

to ease qdisc_tree_reduce_backlog() callers' life:

1. update_vf() decreases cl->cl_nactive, so we can check whether it is

non-zero before calling it.

2. eltree_remove() always removes RB node cl->el_node, but we can use

RB_EMPTY_NODE() + RB_CLEAR_NODE() to make it safe.