For a while, there were suspicions that Reto Berra was billing extra for overtime. On this night, the Calgary Flames netminder got the job done in regulation. Berra, who made NHL history by earning the first seven victories of his career in overtime or shootout situations, kicked aside 28 shots in only 60 minutes of action to backstop the Flames to Thursday’s 4-2 triumph over the New York Islanders at a half-empty Nassau Coliseum. After 26 appearances in his first big-league season, the Sochi-bound goalie from Bulach, Switzerland — finally — has a regulation win to his credit. “If I would play in Switzerland, it would be tough, because in Switzerland, you get three points after 60 minutes and just two in OT,” Berra said. “I have to say, I feel really good to have a win after 60.” It must have been a nifty feeling, too, to get some support at the opposite end of the rink. In Berra’s past eight starts, the Flames scored a whopping eight times. You don’t need a calculator to crunch that goals-per-game average.