Added free() calls against memory leak in interval.c.

Michael Meskes <meskes@postgresql.org>

Commit: 1fcaceeae02e365aea5a8e72eb4ccf5ad02b8cd2
Author: Michael Meskes <meskes@postgresql.org>
Date: 2004-07-05T18:51:51Z
Releases: 8.0.0
Added free() calls against memory leak in interval.c.

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