Merge pull request #6162 from degasus/no_spin_loops

video_core: Avoid spin loops.

src/core/core.cpp

@@ -296,7 +296,7 @@ struct System::Impl {
         exit_lock = false;
 
         if (gpu_core) {
-            gpu_core->WaitIdle();
+            gpu_core->ShutDown();
         }
 
         services.reset();