pgsql: Added fixes from the coverity report send in by Joachim Wieland

Log Message:
-----------
Added fixes from the coverity report send in by Joachim Wieland <joe(at)mcknight(dot)de>
Added missing error handling in a few functions in ecpglib.

Tags:
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REL8_1_STABLE

Modified Files:
--------------
pgsql/src/interfaces/ecpg/compatlib:
informix.c (r1.39.2.2 -> r1.39.2.3)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/compatlib/informix.c.diff?r1=1.39.2.2&r2=1.39.2.3)
pgsql/src/interfaces/ecpg/ecpglib:
connect.c (r1.26.2.2 -> r1.26.2.3)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/ecpglib/connect.c.diff?r1=1.26.2.2&r2=1.26.2.3)
data.c (r1.29.2.1 -> r1.29.2.2)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/ecpglib/data.c.diff?r1=1.29.2.1&r2=1.29.2.2)
descriptor.c (r1.12.6.2 -> r1.12.6.3)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/ecpglib/descriptor.c.diff?r1=1.12.6.2&r2=1.12.6.3)
execute.c (r1.43.2.2 -> r1.43.2.3)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/ecpglib/execute.c.diff?r1=1.43.2.2&r2=1.43.2.3)
extern.h (r1.15 -> r1.15.2.1)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/ecpglib/extern.h.diff?r1=1.15&r2=1.15.2.1)
pgsql/src/interfaces/ecpg/pgtypeslib:
datetime.c (r1.25.2.1 -> r1.25.2.2)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/pgtypeslib/datetime.c.diff?r1=1.25.2.1&r2=1.25.2.2)
dt_common.c (r1.32.2.1 -> r1.32.2.2)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/pgtypeslib/dt_common.c.diff?r1=1.32.2.1&r2=1.32.2.2)
numeric.c (r1.23.2.2 -> r1.23.2.3)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/pgtypeslib/numeric.c.diff?r1=1.23.2.2&r2=1.23.2.3)
timestamp.c (r1.34 -> r1.34.2.1)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/pgtypeslib/timestamp.c.diff?r1=1.34&r2=1.34.2.1)
pgsql/src/interfaces/ecpg/test:
dt_test.pgc (r1.8 -> r1.8.2.1)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/test/dt_test.pgc.diff?r1=1.8&r2=1.8.2.1)