Re: [libvirt] [PATCH] domain_conf: Delete the USB controller check from the USB Device checklist on virDomainDeviceIsUSB

When using "virsh attach-device" to attach a device, the virDomainDefCompatibleDevice function will check the compatibility. If the device is a USB device, but the VM don't have any USB controller, the execution of "virsh attach-device" will fails. It considers the USB controller as a USB device on virDomainDeviceIsUSB, so we can't use "virsh attach-device" to attach a USB controller for a VM which don't have any other USB controller.

Signed-off-by: Liu Ji <jeremy.liu(a)huawei.com&gt;