Jerry Seinfeld issued an apology to Howard Stern after he said he wasn’t funny, RadarOnline.com has learned. The sitcom star trashed Stern during a recent appearance on Dana Carvey and David Spade’s Fly on the Wall podcast and is walking back his statements. Stern’s name was dragged while Seinfeld, Carvey, and Spade discussed the popularity of podcasts, particularly those hosted by comedians. While Seinfeld acknowledged Stern was due praise for bringing the podcast format into the mainstream through his interview style on his hit radio show, he claimed the longtime shock jock has been left beh…