Both files referred to pg_hmac_ctx->data, which, I guess, comes from the
early versions of the patch that has resulted in commit e6bdfd97.

Author: Sergey Shinderuk
Discussion: https://postgr.es/m/8cbb56dd-63d6-a581-7a65-25a97ac4be03@postgrespro.ru
Backpatch-through: 14