DALLAS – After stepping away from MMA this past year while battling a severe case of burnout,  Nick Diaz is growing more and more certain he wants to fight again. In fact, he’s ready to fight now. “I’m ready to go; I’m ready to fight,” Diaz (26-9 MMA, 7-6 UFC) said backstage today at UFC 171, which took place at American Airlines Center in Dallas. Why now as opposed to before