core: fix typo
core: fix typo

This got introduced in
bb552df116d4899717d0095ec006c9b6996720c4. It was left
over from a previous iteration of the code. I should've
cleaned it up but I missed it.

Closes chain/chainprv#2136

chain/chain,chain/chain,chain/chain,chain/chain,chain/chain,chain/chain