io_uring: improve argument types of kiocb_done()

kiocb_done() accepts a pointer to struct kiocb, pass struct io_kiocb
(i.e. io_uring's request) instead so we can get rid of useless
container_of().

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/252016eed77806f58b48251a85cd8c645f900433.1637524285.git.asml.silence@gmail.com


Signed-off-by: Jens Axboe <axboe@kernel.dk>