A man was convicted Wednesday of federal terrorism charges in the 2022 stabbing of Salman Rushdie, the author who has faced a decades-old death threat over his novel “The Satanic Verses.” A jury found Hadi Matar guilty of all the charges against him, including engaging in an act of transnational terrorism. Matar, 28, is already serving a 25-year New York state prison sentence on an attempted murder conviction in the August 2022 attack on an amphitheater stage. The federal conviction carries a potential life sentence. Rushdie, who was about to speak on writers’ safety, was slashed 15 times in front of a stunned audience.