Summary:
Pull Request resolved: https://github.com/facebook/rocksdb/pull/14458
In `CheckpointImpl::ExportColumnFamily()`, the assignment
`*metadata = result_metadata` is inside the `for` loop over
`db_metadata.levels`. If the column family has no levels, the loop body
never executes, so the `new ExportImportFilesMetaData()` is leaked and
the caller receives a nullptr despite a success status.
Fix: Move `*metadata = result_metadata` outside the loop.
Reviewed By: anand1976
Differential Revision: D95303457
fbshipit-source-id: 6a9be47bcca257803969eb3daac7b91e95143ebf
e43171d6ca