The big NULL replacement party part 5.

Right. ' = NULL' would get a lot of these.

src/ScreenOptionsReviewWorkout.cpp

@@ -66,7 +66,7 @@ void ScreenOptionsCourseOverview::BeginScreen()
 	ScreenOptions::BeginScreen();
 
 	// clear the current song in case it's set when we back out from gameplay
-	GAMESTATE->m_pCurSong.Set( NULL );
+	GAMESTATE->m_pCurSong.Set(nullptr);
 }
 
 ScreenOptionsCourseOverview::~ScreenOptionsCourseOverview()