849a8c0ae0
Summary: Fix -Wsign-compare warnings for gcc9. Pull Request resolved: https://github.com/facebook/rocksdb/pull/5651 Test Plan: Tested with ubuntu19.10+gcc9 Differential Revision: D16567428 fbshipit-source-id: 730b2704d42ba0c4e4ea946a3199bbb34be4c25c