DETROIT — General Motors' common stock was priced at $33 a share this afternoon as the automaker returns to public ownership in one of the biggest initial public offerings ever. The IPO brings the U.S. government closer to getting back part of the $50 billion it gave GM to help it through bankruptcy protection last year. The government will sell 412 million shares and get $13.6 billion. It will still have about 500 million shares, or about 33 percent of GM. It would have to sell them for $53 a share, or $26.4 billion, for taxpayers to get back their...