Charter Communications ’ long-awaited deal to buy Liberty Broadband in an all-stock transaction looks like a win for Charter investors. Charter effectively will buy Liberty Broadband, whose main asset is a roughly 26% stake in the country’s second-largest cable company, at a discount of more than 15% to its net asset value, Barron’s estimates. The Charter-friendly deal bears the imprint of John Malone, 83, who was the controlling shareholder of Liberty Broadband and thus the most influential voice at Charter.