Zeljko Ivanek is one of those actors who, in character, could have made tough guy actors Lee Marvin or Robert Mitchum cry real tears. He almost always plays a hardass, SOB, an unsympathetic ballbuster. And he’s really, really good at it. He was that guy on “Homicide: Life on the Street.” And again on “Oz.” And pretty much everywhere else. And that’s the thing: Ivanek sometimes seems like he’s on every drama on TV. And maybe he is.