Thread: pgsql: Improve error detection and recovery in lo_import()/lo_export().

Log Message:
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Improve error detection and recovery in lo_import()/lo_export().
Problems noted while experimenting with new control-C code for psql.

Modified Files:
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    pgsql/src/interfaces/libpq:
        fe-lobj.c (r1.56 -> r1.57)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/libpq/fe-lobj.c.diff?r1=1.56&r2=1.57)