Обсуждение: pgsql: Further thoughts about lo_export/lo_import error handling: if one

Log Message:
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Further thoughts about lo_export/lo_import error handling: if one of
the lower-level large object functions fails, it will have already set
a suitable error message --- probably something from the backend ---
and it is not useful to overwrite that with a generic 'error while
reading large object' message.  So remove redundant messages.

Modified Files:
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    pgsql/src/interfaces/libpq:
        fe-lobj.c (r1.57 -> r1.58)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/libpq/fe-lobj.c.diff?r1=1.57&r2=1.58)