pgsql: Do not eat memory even in case of an out-of-memory error.

Log Message:
-----------
Do not eat memory even in case of an out-of-memory error.

Modified Files:
--------------
pgsql/src/interfaces/ecpg:
ChangeLog (r1.389 -> r1.390)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/ChangeLog?r1=1.389&r2=1.390)
pgsql/src/interfaces/ecpg/compatlib:
informix.c (r1.55 -> r1.56)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/compatlib/informix.c?r1=1.55&r2=1.56)