Years ago when Judy Garland sang "You Made Me Love You" to a pin-up picture of Clark Gable, she was expressing on film the real-life sentiments of thousands of film fans. Most of us at one time or another have had crushes on stars; most of us get over them. But some people never have - and never will. These days it's the adolescent Donny Osmonds and David Cassidys who come in for the hero-worship. But will the dedication last for them as it has for some of the superstars of the past? John Pitman has been to see a tailor and cutter who is still devoted to the late Errol Flynn; a widower who worships Valentino; and a housewife who reckons that any time she devotes to anything other than the memory of singer Jim Reeves is a waste of time. Fortunately she has a very understanding husband.