pgsql: Fixed some memory bugs that somehow reappeared.

Log Message:
-----------
Fixed some memory bugs that somehow reappeared.
Also fixed a new Coverity report.

Modified Files:
--------------
    pgsql/src/interfaces/ecpg:
        ChangeLog (r1.320 -> r1.321)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/ChangeLog.diff?r1=1.320&r2=1.321)
    pgsql/src/interfaces/ecpg/ecpglib:
        execute.c (r1.57 -> r1.58)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/ecpglib/execute.c.diff?r1=1.57&r2=1.58)
    pgsql/src/interfaces/ecpg/pgtypeslib:
        numeric.c (r1.29 -> r1.30)

(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/pgtypeslib/numeric.c.diff?r1=1.29&r2=1.30)
    pgsql/src/interfaces/ecpg/preproc:
        type.c (r1.69 -> r1.70)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/preproc/type.c.diff?r1=1.69&r2=1.70)
    pgsql/src/interfaces/ecpg/test/expected:
        pgtypeslib-num_test2.c (r1.2 -> r1.3)

(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/test/expected/pgtypeslib-num_test2.c.diff?r1=1.2&r2=1.3)
        sql-dyntest.c (r1.2 -> r1.3)

(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/test/expected/sql-dyntest.c.diff?r1=1.2&r2=1.3)
        sql-dyntest.stderr (r1.2 -> r1.3)

(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/test/expected/sql-dyntest.stderr.diff?r1=1.2&r2=1.3)
    pgsql/src/interfaces/ecpg/test/pgtypeslib:
        num_test2.pgc (r1.2 -> r1.3)

(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/test/pgtypeslib/num_test2.pgc.diff?r1=1.2&r2=1.3)
    pgsql/src/interfaces/ecpg/test/sql:
        dyntest.pgc (r1.2 -> r1.3)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/test/sql/dyntest.pgc.diff?r1=1.2&r2=1.3)