io_uring: deduplicate adding to REQ_F_INFLIGHT

We don't know for how long REQ_F_INFLIGHT is going to stay, cleaner to
extract a helper for marking requests as so.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>