vhost-user-test: fix features mask

VIRTIO_NET_F_MAC is a bit position, not a bit mask.
Signed-off-by: NMaxime Coquelin <maxime.coquelin@redhat.com>
Reviewed-by: NMichael S. Tsirkin <mst@redhat.com>
Signed-off-by: NMichael S. Tsirkin <mst@redhat.com>
Reviewed-by: NMarc-André Lureau <marcandre.lureau@redhat.com>

tests/vhost-user-test.c

@@ -177,7 +177,7 @@ static void init_virtio_dev(TestServer *s)
     qvirtio_set_driver(&dev->vdev);
 
     features = qvirtio_get_features(&dev->vdev);
-    features = features & VIRTIO_NET_F_MAC;
+    features = features & (1u << VIRTIO_NET_F_MAC);
     qvirtio_set_features(&dev->vdev, features);
 
     qvirtio_set_driver_ok(&dev->vdev);