A struggling actor has withdrawn his claim that he is Sonny Bono’s son and an heir to the late singer-turned-congressman’s estate. Sean Machu, 35, was not listed as an heir in court documents filed in Riverside County (Calif.) proposing how Bono’s $1.72 million estate and other assets would be divided. (Bono died in January 1998.) “I can confirm that we are no longer pursuing the claim,” Machu’s attorney, Michael Baranov, said Tuesday. He declined further comment.