[easy] Fix Post 562
[easy] Fix Post 562

https://github.com/libra/libra/pull/582 breaks the fuzzer. I [noticed the issue](https://github.com/libra/libra/pull/582#issuecomment-521506806) before merging, but my fat fingeers missed inserting the fix in the [new version of the PR](https://github.com/libra/libra/compare/8b5bc542505c6bf8d03f71c2080d1a556ed75236..dd3eb647b638ebee7b8e6205d66d558eb48e6900).

The fix is hereby attached.

libra/libra,libra/libra,libra/libra,libra/libra,libra/libra,aptos-labs/aptos-core,aptos-labs/aptos-core,aptos-labs/aptos-core,aptos-labs/aptos-core,aptos-labs/aptos-core,aptos-labs/aptos-core,aptos-labs/aptos-core