Fix typo in message

Alvaro Herrera <alvherre@alvh.no-ip.org>

Commit: a100974751baec7e13a527bf0c378ce8ef2787b6
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Date: 2019-05-28T21:36:14Z
Releases: 12.0
Fix typo in message

I introduced the typo in source code in the course of 75445c1515ff.
Repair.

Files