Database update fails

When I tried to update the database after upgrading to the latest 6.x-1.x-dev, I got the error message

user warning: Duplicate entry 'http://maths.york.ac.uk/yorkmood' for key 1 query: ALTER TABLE parser_common_syndication CHANGE url `url` VARCHAR(32) NOT NULL in C:\xampp\htdocs\trunk\includes\database.mysql-common.inc on line 520.

and in the update logs:

Failed: ALTER TABLE {parser_common_syndication} CHANGE url `url` VARCHAR(32) NOT NULL

The reason for this is that the function parser_common_syndication_update_6101() in parser_common_syndication.install contains the line

$ret[] = update_sql("UPDATE {parser_common_syndication} SET url = '%s' WHERE url = '%s'", md5($url['url']), $url['url']);

Note the %-substitution parameters. These are not supported by update_sql(), see http://api.drupal.org/api/function/update_sql/6