pgsql: Add missing check for malloc failure in plpgsql_extra_checks_che

Add missing check for malloc failure in plpgsql_extra_checks_check_hook().

Per report from Andreas Seltenreich. Back-patch to affected versions.

Report: <874m8nn0hv.fsf@elite.ansel.ydns.eu>

Branch
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REL9_5_STABLE

Details
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http://git.postgresql.org/pg/commitdiff/1d07722f0174b563bbd3640f046dbd4de126ffe4

Modified Files
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src/pl/plpgsql/src/pl_handler.c | 2 ++
1 file changed, 2 insertions(+)

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