OMAHA, Neb. —Josh Prenot failed to advance from the preliminaries of the 200-meter breaststroke at the U.S. Olympic swimming trials Wednesday, a bitter blow for the silver medalist from the 2016 Rio Games. Prenot said he’ll take at least the next year off to “see if I forget how much I currently hate” the sport. He came in as the No. 4 seed but only managed the 17th-best time of 2 minutes, 13.42 seconds. The top 16 advanced to the evening semifinals. Prenot’s time was nearly 6 seconds slower than his performance in Rio, where the 27-year-old Missouri native was runner-up to Dmitriy Balandin of Kazakhstan. Afterward, Prenot apologized for his performance in a series of Twitter posts that also hinted his career may be over. “I’m sorry to the people who have been rooting for me and believing in me,” he wrote. “It’s not for lack of effort, but …