io_uring: fail poll arm on queue proc failure

Check the ipt.error value, it must have been either cleared to zero or
set to another error than the default -EINVAL if we don't go through the
waitqueue proc addition. Just give up on poll at that point and return
failure, this will fallback to async work.

io_poll_add() doesn't suffer from this failure case, as it returns the
error value directly.

Cc: [email protected] # v5.7+
Reported-by: [email protected]
Reviewed-by: Stefano Garzarella <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>

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