test: test ring exit cancels SQPOLL's iowq

Another SQPOLL cancellation test making sure that io_uring_queue_exit()
does cancel all requests and free the ring, in particular for SQPOLL
requests gone to iowq.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
[axboe: silence unchecked read return]
Signed-off-by: Jens Axboe <axboe@kernel.dk>
1 file changed