io_uring: remove __io_state_file_put

The check in io_state_file_put() is optimised pretty well when called
from __io_file_get(). Don't pollute the code with all these variants.

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