It was a couple of minutes before midnight when Charles Oakley, once upon a time the muscle of the Knicks, walked out of Midtown South on a cold winter night. One hour earlier, a young cop stood on the precinct steps and began chanting “Free Charles Oakley! Free Charles Oakley!” That moment finally arrived when Oakley, dressed in a black suit, stepped into an SUV that made a right turn out of the station and sped down 36th Street heading east.