Free memory in ecpg bytea regression test.

Michael Meskes <meskes@postgresql.org>

Commit: 42ccbe4351e4c0b1ad1684323c2fea79c86ae573
Author: Michael Meskes <meskes@postgresql.org>
Date: 2019-02-26T10:59:35Z
Releases: 12.0
Free memory in ecpg bytea regression test.

While not really a problem it's easier to run tools like valgrind against it
when fixed.

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