refactor: Clean up -Wlogical-op warning

Summary:
This commit fixes core#19912 by removing a check that always returned true. That check was causing a -Wlogical-op warning because it treated a constant int as though it were a boolean.
This is a backport of core#19986

Test Plan: ninja all check-all

Reviewers: #bitcoin_abc, Fabien

Reviewed By: #bitcoin_abc, Fabien

Differential Revision: https://reviews.bitcoinabc.org/D10538