Merge tag 'block-pull-request' of https://gitlab.com/stefanha/qemu into staging

Pull request

Jens Axboe's fixes for fdmon-io_uring.

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* tag 'block-pull-request' of https://gitlab.com/stefanha/qemu:
  fdmon-io_uring: check CQ ring directly in gsource_check
  aio-posix: notify main loop when SQEs are queued

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>