pgsql: Fixed memory leak bugs found by Martijn Oosterhout.

Log Message:
-----------
Fixed memory leak bugs found by Martijn Oosterhout.

Modified Files:
--------------
    pgsql/src/interfaces/ecpg:
        ChangeLog (r1.301 -> r1.302)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/ChangeLog.diff?r1=1.301&r2=1.302)
    pgsql/src/interfaces/ecpg/compatlib:
        informix.c (r1.41 -> r1.42)

(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/compatlib/informix.c.diff?r1=1.41&r2=1.42)
    pgsql/src/interfaces/ecpg/ecpglib:
        execute.c (r1.44 -> r1.45)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/ecpglib/execute.c.diff?r1=1.44&r2=1.45)
    pgsql/src/interfaces/ecpg/pgtypeslib:
        numeric.c (r1.25 -> r1.26)

(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/pgtypeslib/numeric.c.diff?r1=1.25&r2=1.26)