Merge pull request #2000 from degasus/master

VideoBackends: set GLInterface to zero after deleting it

Source/Core/VideoBackends/OGL/main.cpp

@@ -226,6 +226,7 @@ void VideoBackend::Shutdown()
 
 	GLInterface->Shutdown();
 	delete GLInterface;
+	GLInterface = nullptr;
 }
 
 void VideoBackend::Video_Cleanup()

Source/Core/VideoBackends/Software/SWmain.cpp

@@ -164,6 +164,7 @@ void VideoSoftware::Shutdown()
 
 	GLInterface->Shutdown();
 	delete GLInterface;
+	GLInterface = nullptr;
 }
 
 void VideoSoftware::Video_Cleanup()