"Max," says the parole officer, "I think you have a serious attitude problem." Just how serious is the dramatic substance of "Straight Time," the grimly witty account of the decline of Max Dembo (Dustin Hoffman), an ex-con (six years for armed robbery) who would say that he pursues success though he measures his life in small failures and the treacheries of others.He knows the world is crooked and he behaves accordingly. Like millions of other people who live on the right side of the law, Max never questions the system. He simply tries to beat it in his own half-baked way.