Chris Willman Music WriterA good number of music stars took the death of music impresario Michael Gudinski personally, but few more so than Ed Sheeran, who flew to Gudinski’s native Australia after learning of his passing and quarantined there long enough to be able to perform at a nationally televised state memorial tribute Wednesday.More than that, Sheeran wrote a new life-and-death-themed ballad for the occasion, “Visiting Hours,” which he debuted on the widely seen telecast, and had just