virgl: wait for the right resource

In case we're resolving, we need to wait for the resolved resource
instead of the original one.

Signed-off-by: Erik Faye-Lund <erik.faye-lund@collabora.com>
Reviewed-by: Gurchetan Singh <gurchetansingh@chromium.org>

src/gallium/drivers/virgl/virgl_texture.c

@@ -154,7 +154,7 @@ static void *virgl_texture_transfer_map(struct pipe_context *ctx,
       vs->vws->transfer_get(vs->vws, src_res->hw_res, box, trans->base.stride,
                             trans->l_stride, trans->offset, level);
 
-      vs->vws->resource_wait(vs->vws, vtex->hw_res);
+      vs->vws->resource_wait(vs->vws, src_res->hw_res);
    }
 
    ptr = vs->vws->resource_map(vs->vws, src_res->hw_res);