Summary:
Pull Request resolved: https://github.com/facebook/rocksdb/pull/12271
`-Wextra-semi` or `-Wextra-semi-stmt`
If the code compiles, this is safe to land.
Reviewed By: jaykorean
Differential Revision: D52969070
fbshipit-source-id: 22e0958ad6ced5c021ef7dafbe16a17c282935d8