Fixing valgrind error in checkpoint_test

Summary: Fixed a valgrind issue in checkpoint_test

Test Plan: valgrind on checkpoint_test

Reviewers: igor, anthony

Reviewed By: anthony

Subscribers: dhruba, leveldb

Differential Revision: https://reviews.facebook.net/D40455

utilities/checkpoint/checkpoint_test.cc

@@ -298,6 +298,7 @@ TEST_F(DBTest, CheckpointCF) {
     Checkpoint* checkpoint;
     ASSERT_OK(Checkpoint::Create(db_, &checkpoint));
     ASSERT_OK(checkpoint->CreateCheckpoint(snapshot_name));
+    delete checkpoint;
   });
   TEST_SYNC_POINT("DBTest::CheckpointCF:1");
   ASSERT_OK(Put(0, "Default", "Default1"));