Merge branch 'tc-filter-cleanup-destroy-delete'

Cong Wang says:

====================
net_sched: clean up tc filter destroy and delete logic

The first patch fixes a potenial race condition, the second one
is pure cleanup.
====================

Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>