Yi Wu 849a8c0ae0 fix sign compare warnings (#5651)
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
2019-07-30 14:12:54 -07:00
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