Fixed some memory bugs that somehow reappeared.

src/interfaces/ecpg/ChangeLog

src/interfaces/ecpg/ecpglib/execute.c

src/interfaces/ecpg/pgtypeslib/numeric.c

src/interfaces/ecpg/preproc/type.c

src/interfaces/ecpg/test/expected/pgtypeslib-num_test2.c

src/interfaces/ecpg/test/expected/sql-dyntest.c

src/interfaces/ecpg/test/expected/sql-dyntest.stderr

src/interfaces/ecpg/test/pgtypeslib/num_test2.pgc

src/interfaces/ecpg/test/sql/dyntest.pgc