For Detroit bantamweight Jarico O’Quinn, it had been a half-year of frustrating inactivity and two cancelled fights before finally getting into the ring last night and getting some much-needed work against a tough, meaningful opponent, Nick Otieno, 31-13, Kenya, who steadily moved forward and made O’Quinn, 8-0-1, work for his six-round win last night at Warren, Michigan’s DeCarlo’s Banquet and Convention Center