Fix case of not unregistering event that synchronously failed.
Fix case of not unregistering event that synchronously failed.

mozy/mordor,ccutrer/mordor,cgaebel/mordor,mozy/mordor,adfin/mordor,mozy/mordor,mtanski/mordor,mtanski/mordor,cgaebel/mordor,mtanski/mordor,ccutrer/mordor,ccutrer/mordor,adfin/mordor,adfin/mordor