message: Fix instance getters to support extensions
  This commit allows the user to pass in a chain of structures
  to be filled in by the Vulkan driver.
diff: @@ -108,16 +108,13 @@ pub trait InstanceV1_1: InstanceV1_0 {
  }
  }
  - fn get_physical_device_properties2(
  + unsafe fn get_physical_device_properties2(
  &self,
  physical_device: vk::PhysicalDevice,
  - ) -> vk::PhysicalDeviceProperties2 {
  - unsafe {
  - let mut prop = mem::uninitialized();
  + prop: &mut vk::PhysicalDeviceProperties2,
  + ) {
  self.fp_v1_1()
  - .get_physical_device_properties2(physical_device, &mut prop);
  - prop
  - }
  + .get_physical_device_properties2(physical_device, prop);
  }
  fn get_physical_device_format_properties2(
  @@ -140,15 +137,15 @@ pub trait InstanceV1_1: InstanceV1_0 {
  &self,
  physical_device: vk::PhysicalDevice,
  format_info: &vk::PhysicalDeviceImageFormatInfo2,
  - ) -> VkResult<vk::ImageFormatProperties2> {
  - let mut image_format_prop = mem::uninitialized();
  + image_format_prop: &mut vk::ImageFormatProperties2
  + ) -> VkResult<()> {
  let err_code = self.fp_v1_1().get_physical_device_image_format_properties2(
  physical_device,
  format_info,
  - &mut image_format_prop,
  + image_format_prop,
  );
  if err_code == vk::Result::SUCCESS {
  - Ok(image_format_prop)
  + Ok(())
  } else {
  Err(err_code)
  }
  