Fix worker implementation to preserve error codes. git-svn-id: svn://localhost/ardour2/branches/3.0@11877 d708f5d6-7413-0410-9779-e7cbd77b26cf
Fix worker implementation to preserve error codes. git-svn-id: svn://localhost/ardour2/branches/3.0@11877 d708f5d6-7413-0410-9779-e7cbd77b26cf