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_0_STABLE

Modified Files:
--------------
pgsql/src/interfaces/ecpg/compatlib:
informix.c (r1.38.4.1 -> r1.38.4.2)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/compatlib/informix.c.diff?r1=1.38.4.1&r2=1.38.4.2)
pgsql/src/interfaces/ecpg/ecpglib:
connect.c (r1.24.4.3 -> r1.24.4.4)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/ecpglib/connect.c.diff?r1=1.24.4.3&r2=1.24.4.4)
data.c (r1.27.4.2 -> r1.27.4.3)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/ecpglib/data.c.diff?r1=1.27.4.2&r2=1.27.4.3)
descriptor.c (r1.12.4.2 -> r1.12.4.3)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/ecpglib/descriptor.c.diff?r1=1.12.4.2&r2=1.12.4.3)
execute.c (r1.38.4.4 -> r1.38.4.5)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/ecpglib/execute.c.diff?r1=1.38.4.4&r2=1.38.4.5)
extern.h (r1.11.4.2 -> r1.11.4.3)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/ecpglib/extern.h.diff?r1=1.11.4.2&r2=1.11.4.3)
pgsql/src/interfaces/ecpg/pgtypeslib:
datetime.c (r1.20 -> r1.20.4.1)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/pgtypeslib/datetime.c.diff?r1=1.20&r2=1.20.4.1)
dt_common.c (r1.20 -> r1.20.4.1)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/pgtypeslib/dt_common.c.diff?r1=1.20&r2=1.20.4.1)
numeric.c (r1.20.4.1 -> r1.20.4.2)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/pgtypeslib/numeric.c.diff?r1=1.20.4.1&r2=1.20.4.2)
timestamp.c (r1.23 -> r1.23.4.1)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/pgtypeslib/timestamp.c.diff?r1=1.23&r2=1.23.4.1)
pgsql/src/interfaces/ecpg/test:
dt_test.pgc (r1.7 -> r1.7.6.1)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/test/dt_test.pgc.diff?r1=1.7&r2=1.7.6.1)