flush_scheduled_work() is deprecated and scheduled to be removed.
* Flush the used works directly.
* Replace the deprecated cancel_rearming_delayed_work() +
flush_scheduled_work() -> cancel_delayed_work_sync().
* Make sure mantis->uart_work isn't running on exit.
Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Mauro Carvalho Chehab <mchehab@infradead.org>
Cc: linux-media@vger.kernel.org