STOCKHOLM (Reuters) - The United States would free a Swede held at Guantanamo Bay if Sweden made sure he did not engage in terror activities, a Swedish newspaper reported on Sunday, quoting U.S. and Swedish government officials. A Western diplomat told Reuters the report could signal a policy shift aimed at defusing criticism of President Bush's war on terror in the run up to his campaign for re-election next year. Swedish foreign ministry spokesman Jan Janonius said negotiations about Mehdi-Muhammed Ghezali, a 24-year-old Swede held captive for almost two years at the U.S. military base in Cuba, were under way,...