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

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

Modified Files:
--------------
pgsql/src/interfaces/ecpg:
ChangeLog (r1.304 -> r1.305)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/ChangeLog.diff?r1=1.304&r2=1.305)
pgsql/src/interfaces/ecpg/compatlib:
informix.c (r1.42 -> r1.43)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/compatlib/informix.c.diff?r1=1.42&r2=1.43)
pgsql/src/interfaces/ecpg/ecpglib:
connect.c (r1.28 -> r1.29)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/ecpglib/connect.c.diff?r1=1.28&r2=1.29)
data.c (r1.31 -> r1.32)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/ecpglib/data.c.diff?r1=1.31&r2=1.32)
descriptor.c (r1.14 -> r1.15)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/ecpglib/descriptor.c.diff?r1=1.14&r2=1.15)
execute.c (r1.46 -> r1.47)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/ecpglib/execute.c.diff?r1=1.46&r2=1.47)
extern.h (r1.16 -> r1.17)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/ecpglib/extern.h.diff?r1=1.16&r2=1.17)
pgsql/src/interfaces/ecpg/pgtypeslib:
datetime.c (r1.28 -> r1.29)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/pgtypeslib/datetime.c.diff?r1=1.28&r2=1.29)
dt_common.c (r1.34 -> r1.35)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/pgtypeslib/dt_common.c.diff?r1=1.34&r2=1.35)
numeric.c (r1.26 -> r1.27)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/pgtypeslib/numeric.c.diff?r1=1.26&r2=1.27)
timestamp.c (r1.34 -> r1.35)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/pgtypeslib/timestamp.c.diff?r1=1.34&r2=1.35)
pgsql/src/interfaces/ecpg/test:
dt_test.pgc (r1.9 -> r1.10)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/test/dt_test.pgc.diff?r1=1.9&r2=1.10)