rename a function

stepmania/src/ScreenManager.cpp

@@ -272,7 +272,7 @@ Screen* ScreenManager::MakeNewScreen( CString sClassName )
 	DISPLAY->ResetStats();
 
 	/* This is a convenient time to clean up our song cache. */
-	SONGMAN->CleanCourses();
+	SONGMAN->CleanData();
 
 	return ret;
 }

stepmania/src/SongManager.cpp

@@ -450,7 +450,7 @@ void SongManager::FreeCourses()
 
 /* Called periodically to wipe out cached NoteData.  This is called when we change
  * screens. */
-void SongManager::CleanCourses()
+void SongManager::CleanData()
 {
 	for( unsigned i=0; i<m_pSongs.size(); i++ )
 	{

stepmania/src/SongManager.h

@@ -49,7 +49,7 @@ public:
 
 	void InitCoursesFromDisk();
 	void FreeCourses();
-	void CleanCourses();
+	void CleanData();