tests: adjust test-aio to new aio_poll() semantics
aio_poll(ctx, true) will soon block if any fd handlers have been set. Previously it would only block when .io_flush() returned true. This means that callers must check their wait condition *before* aio_poll() to avoid deadlock. Reviewed-by: NPaolo Bonzini <pbonzini@redhat.com> Signed-off-by: NStefan Hajnoczi <stefanha@redhat.com>
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