Ernst Martin Witte 41ff9142df [media] ts2020: cancel_delayed_work_sync before device removal / kfree
ts2020_remove  was  calling  kfree(dev)  with  possibly  still  active
schedule_delayed_work(dev->stat_work).  A similar bug in si2157 caused
kernel panics in call_timer_fn e.g. after rmmod cx23885.

Signed-off-by: Ernst Martin Witte <emw-linux-kernel@nocabal.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
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