io_uring: cleanup files_update looping

Replace a while with a simple for loop, that looks way more natural, and
enables us to use "continue" as indexes are no more updated by hand in
the end of the loop.

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