Fix checkpoint_test valgrind complaint
Fix checkpoint_test valgrind complaint

amaliujia/CMUDB-peloton,larryxiao/peloton,amaliujia/CMUDB-peloton,larryxiao/peloton,larryxiao/peloton,amaliujia/CMUDB-peloton,larryxiao/peloton,ranxian/peloton,larryxiao/peloton,ranxian/peloton,amaliujia/CMUDB-peloton,ranxian/peloton,ranxian/peloton,amaliujia/CMUDB-peloton,amaliujia/CMUDB-peloton,amaliujia/CMUDB-peloton,larryxiao/peloton,larryxiao/peloton,ranxian/peloton,ranxian/peloton