message: Repair 32 bit build.
diff: @@ -546,7 +546,7 @@ void transitionImageLayout(VkCommandBuffer cmdbuffer, VulkanLayoutTransition tra
  if (transition.oldLayout == transition.newLayout) {
  return;
  }
  - assert_invariant(transition.image != nullptr && "Please call bindToSwapChain.");
  + assert_invariant(transition.image != VK_NULL_HANDLE && "Please call bindToSwapChain.");
  VkImageMemoryBarrier barrier = {};
  barrier.sType = VK_STRUCTURE_TYPE_IMAGE_MEMORY_BARRIER;
  barrier.oldLayout = transition.oldLayout;
  