Use more appropriate DatumGet* function

Peter Eisentraut <peter@eisentraut.org>

Commit: 8c6bbd674ed810df9af5ec42f6b38c205e3ad365
Author: Peter Eisentraut <peter@eisentraut.org>
Date: 2025-12-03T07:52:28Z
Use more appropriate DatumGet* function

Use DatumGetCString() instead of DatumGetPointer() for returning a C
string.  Right now, they are the same, but that doesn't always have to
be so.

Reviewed-by: Chao Li <li.evan.chao@gmail.com>
Reviewed-by: Bertrand Drouvot <bertranddrouvot.pg@gmail.com>
Discussion: https://www.postgresql.org/message-id/4154950a-47ae-4223-bd01-1235cc50e933%40eisentraut.org

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