Merge pull request #5807 from ReinUsesLisp/vc-warnings

video_core: Silence the remaining gcc warnings and enforce them

src/video_core/vulkan_common/vulkan_debug_callback.cpp

@@ -39,6 +39,7 @@ vk::DebugUtilsMessenger CreateDebugCallback(const vk::Instance& instance) {
                        VK_DEBUG_UTILS_MESSAGE_TYPE_VALIDATION_BIT_EXT |
                        VK_DEBUG_UTILS_MESSAGE_TYPE_PERFORMANCE_BIT_EXT,
         .pfnUserCallback = Callback,
+        .pUserData = nullptr,
     });
 }