Follow up to f0a0a4ae3a75c57c7f0d2f2492042429e8c487b3

Sources/VLCMediaPlayer.m

@@ -1381,7 +1381,7 @@ static void HandleMediaPlayerRecord(const libvlc_event_t * event, void * self)
         libvlc_retain([_privateLibrary instance]);
         _playerInstance = libvlc_media_player_new([_privateLibrary instance]);
         if (_playerInstance == NULL) {
-            NSAssert(0, "%s: player initialization failed", __PRETTY_FUNCTION__);
+            NSAssert(0, @"%s: player initialization failed", __PRETTY_FUNCTION__);
             libvlc_release([_privateLibrary instance]);
             return nil;
         }