virtio-net: switch exit callback to VirtioDeviceClass
This ensures hot-unplug is handled properly by the proxy, and avoids leaking bus_name which is freed by virtio_device_exit. Cc: qemu-stable@nongnu.org Acked-by: NAndreas Faerber <afaerber@suse.de> Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
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