We don't need completion_lock for timeout flushing, don't take it.
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/1e3dc657975ac445b80e7bdc40050db783a5935a.1670002973.git.asml.silence@gmail.comSigned-off-by: Jens Axboe <axboe@kernel.dk>