Director Nanni Moretti is pleased to hear that some audience members came out of “Mia Madre,” his new movie about a filmmaker whose mother is dying, and immediately called their own moms to say “I love you.” The director said during an interview in Cannes, “Every once in a while, movies do the right thing.” The film — “My Mother” in English — is competing for the Palme d’Or top prize. The movie is a return to directly personal subject for the Italian Moretti after his last film, “We Have a Pope,” focused on a pontiff-elect who gets cold feet about the job. oretti began work on “My Mother” after his own mother died in 2010.