fix minor memleaks

stepmania/src/MemoryCardManager.cpp

@@ -45,7 +45,7 @@ MemoryCardManager::MemoryCardManager()
 
 MemoryCardManager::~MemoryCardManager()
 {
-
+	delete m_pDriver;
 }
 
 void MemoryCardManager::Update( float fDelta )

stepmania/src/SDL_utils.cpp

@@ -1153,7 +1153,10 @@ SDL_Surface *SDL_LoadImage( const CString &sPath )
 	if( rw == NULL )
 		return NULL;
 
-	return IMG_LoadTyped_RW( rw, true, (char *) GetExtension(sPath).c_str() );
+	SDL_Surface *ret = IMG_LoadTyped_RW( rw, true, (char *) GetExtension(sPath).c_str() );
+	SDL_FreeRW( rw );
+
+	return ret;
 }
 
 struct RWString

stepmania/src/SongManager.cpp

@@ -93,6 +93,7 @@ SongManager::SongManager( LoadingWindow *ld )
 SongManager::~SongManager()
 {
 	FreeSongs();
+	FreeCourses();
 }
 
 void SongManager::Reload()