io_uring: make io_cqring_events() take 'ctx' as argument

The rings can be derived from the ctx, and we need the ctx there for
a future change.

No functional changes in this patch.

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