This routine was calling ecpg_alloc to allocate to memory but did not

Michael Meskes <meskes@postgresql.org>

Commit: 5ee5bc387319b9ac33083bacebd3ab7046666328
Author: Michael Meskes <meskes@postgresql.org>
Date: 2015-02-05T14:12:34Z
Releases: 9.5.0
This routine was calling ecpg_alloc to allocate to memory but did not
actually check the returned pointer allocated, potentially NULL which
could be the result of a malloc call.

Issue noted by Coverity, fixed by Michael Paquier <michael@otacoo.com>

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