The gates of R. Kelly’s onetime “Chocolate Factory” mansion in suburban Chicago have closed for good — and at a steep discount. The 21,000-square-foot estate, where the R&B singer once recorded hits and allegedly exerted disturbing control over those who entered, just sold for $1.6 million, according to Alex Wolking of Keller Williams ONEChicago, who represented the listing. That’s less than half its $3.5 million asking price and only a hair above what it fetched in foreclosure more than a