pgsql: Fix memory leak in connection string validation.

Fix memory leak in connection string validation. Introduced in commit c3afe8cf5a. Discussion: https://postgr.es/m/[email protected] Reviewed-by: Nathan Bossart, Tom Lane Backpatch-through: 16 Branch -- REL_16_STABLE Details --- https://git.postg

pgsql: Fix memory leak in connection string validation.

Fix memory leak in connection string validation. Introduced in commit c3afe8cf5a. Discussion: https://postgr.es/m/[email protected] Reviewed-by: Nathan Bossart, Tom Lane Backpatch-through: 16 Branch -- master Details --- https://git.postgresql.o