Clean up a few places where Datums were being treated as pointers (and vice

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

Commit: 2f0f7b4bce13e68394543728801ef011fd82fac6
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Date: 2008-04-17T21:37:28Z
Releases: 8.4.0
Clean up a few places where Datums were being treated as pointers (and vice
versa) without going through DatumGetPointer.

Gavin Sherry, with Feng Tian.

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