* power_supply_unregister call bq27x00_battery_get_property which
  call bq27x00_battery_poll
* make sure that bq27x00_battery_poll will not call
  schedule_delayed_work again after unregister (which cause OOPS)
Signed-off-by: NPali Rohár <pali.rohar@gmail.com>
Signed-off-by: NAnton Vorontsov <cbouatmailru@gmail.com>