Don't load `sync2` ext if `nv_checkpoints` isn't used

src/video_core/renderer_vulkan/vk_instance.cpp

@@ -220,12 +220,12 @@ bool Instance::CreateDevice() {
     const bool maintenance5 = add_extension(VK_KHR_MAINTENANCE_5_EXTENSION_NAME);
     add_extension(VK_KHR_DYNAMIC_RENDERING_EXTENSION_NAME);
     add_extension(VK_EXT_SHADER_DEMOTE_TO_HELPER_INVOCATION_EXTENSION_NAME);
-    const bool has_sync2 = add_extension(VK_KHR_SYNCHRONIZATION_2_EXTENSION_NAME);
 
-    if (has_sync2) {
-        has_nv_checkpoints = Config::isMarkersEnabled()
-                                 ? add_extension(VK_NV_DEVICE_DIAGNOSTIC_CHECKPOINTS_EXTENSION_NAME)
-                                 : false;
+    if (Config::isMarkersEnabled()) {
+        const bool has_sync2 = add_extension(VK_KHR_SYNCHRONIZATION_2_EXTENSION_NAME);
+        if (has_sync2) {
+            has_nv_checkpoints = add_extension(VK_NV_DEVICE_DIAGNOSTIC_CHECKPOINTS_EXTENSION_NAME);
+        }
     }
 
 #ifdef __APPLE__