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Not all vhost-user backends support ops->vhost_net_set_backend(). It is a nicer to provide an assert/error than to crash trying to call. Furthermore, it improves a bit the code by hiding vhost_ops details. Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>