BUG #5750: dropping objects owned by user fails

The following bug has been logged online:

Bug reference:      5750
Logged by:          Chetan
Email address:      chetan.suttraway@enterprisedb.com
PostgreSQL version: 9.0.1
Operating system:   Ubuntu 9.10
Description:        dropping objects owned by user fails
Details:

steps to reproduce:

psql (9.0.1)
Type "help" for help.

postgres=# create user t;
CREATE ROLE
postgres=# create foreign data wrapper wrap123;
CREATE FOREIGN DATA WRAPPER
postgres=# grant usage on foreign data wrapper wrap123 to t;
GRANT
postgres=# drop owned by t;
ERROR:  unexpected object class 2328
postgres=#