net: sched: factorize code (qdisc_drop())

Use qdisc_drop() helper where possible.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --cc net/sched/sch_choke.c
Simple merge

diff --cc net/sched/sch_dsmark.c
Simple merge

diff --cc net/sched/sch_htb.c
Simple merge

diff --cc net/sched/sch_teql.c
Simple merge