Silence compiler warnings

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

Commit: 3be5fe2b107fae24e03c9d29d7bd7c7ad5345787
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Date: 2018-11-23T16:01:05Z
Releases: 12.0
Silence compiler warnings

Commit cfdf4dc4fc96 left a few unnecessary assignments, one of which
caused compiler warnings, as reported by Erik Rijkers.  Remove them all.

Discussion: https://postgr.es/m/df0dcca2025b3d90d946ecc508ca9678@xs4all.nl

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