Vulkan ClearScreenDemo has a bug WRT maxImageCount

[janitza-mage]

In createSwapchain(), The line

int imageCount = min(max(pSurfaceCapabilities.minImageCount(), 2), pSurfaceCapabilities.maxImageCount());

does not handle the fact that maxImageCount() may return 0 to indicate "no limit", setting imageCount to 0 and creating a zero-image swapchain. The application subsequently crashes with "Index 0 out of bounds for length 0".