Fix memory leak in cache_test introduced in the previous commit

Test Plan: Verified that valgrind build passes for cache_test

Reviewers: igor

Reviewed By: igor

Subscribers: dhruba

Differential Revision: https://reviews.facebook.net/D37665

util/cache_test.cc

@@ -383,6 +383,11 @@ TEST_F(CacheTest, SetCapacity) {
   cache->SetCapacity(7);
   ASSERT_EQ(7, cache->GetCapacity());
   ASSERT_EQ(7, cache->GetUsage());
+
+  // release remaining 5 to keep valgrind happy
+  for (size_t i = 5; i < 10; i++) {
+    cache->Release(handles[i]);
+  }
 }
 
 TEST_F(CacheTest, OverCapacity) {