virtio: introduce virtio_get_num_queues()
This patch introduces virtio_get_num_queues() which iterates the vqs array and return the number of virtqueues used by device. Signed-off-by: NJason Wang <jasowang@redhat.com> Reviewed-by: NMichael S. Tsirkin <mst@redhat.com> Signed-off-by: NMichael S. Tsirkin <mst@redhat.com>
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