add delete db for all tests

test/ttl_test.cc

@@ -72,6 +72,8 @@ TEST(TestTTL, ReadTTL) {
         status = db->Get(readOptions, key, &value);
         ASSERT_FALSE(status.ok());
     }
+
+    delete db;
 }
 
 TEST(TestTTL, CompactionTTL) {
@@ -100,6 +102,8 @@ TEST(TestTTL, CompactionTTL) {
     uint64_t sizes1[1];
     db->GetApproximateSizes(ranges1, 1, sizes1);
     ASSERT_EQ(sizes1[0], 0);
+
+    delete db;
 }