sdong 12d798ac06 Always iniitalize ArenaWrappedDBIter::db_iter_ to nullptr (#8889)
Summary:
ArenaWrappedDBIter::db_iter_ should never be nullptr. However, when debugging a segfault, it's hard to distinguish it is not initialized (not possible) and other corruption. Add this nullptr to help distinguish the case.

Pull Request resolved: https://github.com/facebook/rocksdb/pull/8889

Test Plan: Run existing unit tests.

Reviewed By: pdillinger

Differential Revision: D30814756

fbshipit-source-id: 4b1f36896a33dc203d4f1f424ded9554927d61ba
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