[CF 5586] Fix api misuse (src/bin/pg_amcheck/pg_amcheck.c)

This branch was automatically generated by a robot using patches from an
email thread registered at:

https://commitfest.postgresql.org/patch/5586

The branch will be overwritten each time a new patch version is posted to
the thread, and also periodically to check for bitrot caused by changes
on the master branch.

Patch(es): https://www.postgresql.org/message-id/CAEudQArbTWVSbxq608GRmXJjnNSQ0B6R7CSffNnj2hPWMUsRNg@mail.gmail.com
Author(s): Ranier Vilela

Author: Commitfest Bot