Fix memory leak in connection string validation.

Jeff Davis <jdavis@postgresql.org>

Commit: 41820e640af14ab9d2a8d29692fc8b2b79655ecb
Author: Jeff Davis <jdavis@postgresql.org>
Date: 2024-01-13T05:39:35Z
Releases: 16.2
Fix memory leak in connection string validation.

Introduced in commit c3afe8cf5a.

Discussion: https://postgr.es/m/066a65233d3cb4ea27a9e0778d2f1d0dc764b222.camel@j-davis.com
Reviewed-by: Nathan Bossart, Tom Lane
Backpatch-through: 16

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