virtio: check VirtQueue Vring object is set
A guest could attempt to use an uninitialised VirtQueue object or unset Vring.align leading to a arithmetic exception. Add check to avoid it. Reported-by: NZhangboxian <zhangboxian@huawei.com> Signed-off-by: NPrasad J Pandit <pjp@fedoraproject.org> Reviewed-by: NMichael S. Tsirkin <mst@redhat.com> Signed-off-by: NMichael S. Tsirkin <mst@redhat.com> Reviewed-by: NStefan Hajnoczi <stefanha@redhat.com> Reviewed-by: NCornelia Huck <cohuck@redhat.com>
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