Merge "libvulkan: add a nullptr check for ANativeWindow*"

    bool active = swapchain->surface.swapchain_handle == swapchain_handle;

    ANativeWindow* window = active ? swapchain->surface.window.get() : nullptr;

    if (swapchain->frame_timestamps_enabled) {

    if (window && swapchain->frame_timestamps_enabled) {

        native_window_enable_frame_timestamps(window, false);

    }

    for (uint32_t i = 0; i < swapchain->num_images; i++)