JOSEPH AX and JONATHAN STEMPEL BILL Cosby was freed from prison and has returned home, less than two hours after Pennsylvania's highest court overturned his sexual assault conviction, saying he never should have faced charges after striking a non-prosecution deal with a previous district attorney more than 15 years ago. The Pennsylvania Supreme Court issued its split decision after Cosby had served more than two years of a three- to 10-year sentence following his 2018 conviction. Cosby, 83, was released from a state prison in Shippack, Pennsylvania, just before 2:30 p.m. (1830 GMT), a corrections department spokesperson said. Around an…