It took new USC coach Eric Musselman less than a day to land his first commitment after taking over the Trojans. UMass transfer forward Josh Cohen had been committed to Musselman at Arkansas and evidently got the green light to follow the coach to USC. He announced on social media that he’s flipped his commitment from Arkansas to USC. The 6-foot-10, 220-pound senior averaged 15.9 points and 6.8 rebounds per game this season for the Minutemen. The Lincroft, New Jersey native is currently ranked as the No. 42 overall player in On3’s Transfer Portal Rankings. “I believe in [Eric Musselman],” Cohe…