Anthony PERARD writes ("[PATCH 23/35] libxl: 
libxl__initiate_device_usbdev_remove now use ev_qmp"):
> Signed-off-by: Anthony PERARD <[email protected]>
...
>      libxl_device_usbctrl usbctrl;
> +    bool has_callback = false;

Not sure I like this encoding of program flow in a variable but it
seems correct, and it's a matter of taste, so:

Acked-by: Ian Jackson <[email protected]>

(And I'm not sure I have a better suggestion.)

Ian.

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