virtio-net: fix macaddr config regression

This commit:

    commit 97b15621
    virtio: use qdev properties for configuration.
Signed-off-by: NGerd Hoffmann <kraxel@redhat.com>
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>

makes a guest using virtio-net see an empty macaddr because we never
copy the macaddr into the location that virtio_net_get_config() uses.
Signed-off-by: NMark McLoughlin <markmc@redhat.com>
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>

hw/virtio-net.c

@@ -834,6 +834,7 @@ VirtIODevice *virtio_net_init(DeviceState *dev, NICConf *conf)
     n->tx_vq = virtio_add_queue(&n->vdev, 256, virtio_net_handle_tx);
     n->ctrl_vq = virtio_add_queue(&n->vdev, 64, virtio_net_handle_ctrl);
     qemu_macaddr_default_if_unset(&conf->macaddr);
+    memcpy(&n->mac[0], &conf->macaddr, sizeof(n->mac));
     n->status = VIRTIO_NET_S_LINK_UP;
     n->vc = qemu_new_vlan_client(NET_CLIENT_TYPE_NIC, conf->vlan, conf->peer,
                                  dev->info->name, dev->id,