tu/drm/virtio: Do not free iova from heap for lazy BOs

When initializing a BO using a lazy VMA, the iova is provided by
the sparse VMA and was not allocated from the device's VMA heap.
Avoid calling util_vma_heap_free in the error path for such BOs
to prevent heap corruption and potential double-frees.

Fixes: 88d001383a ("tu: Add support for a "lazy" sparse VMA")
Signed-off-by: Valentine Burley <valentine.burley@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/40507>

src/freedreno/vulkan/tu_knl_drm_virtio.cc

@@ -775,9 +775,11 @@ virtio_bo_init(struct tu_device *dev,
    return VK_SUCCESS;
 
 fail:
+   if (!lazy_vma) {
       mtx_lock(&dev->vma_mutex);
       util_vma_heap_free(&dev->vma, req.iova, size);
       mtx_unlock(&dev->vma_mutex);
+   }
    return result;
 }