Hilary Swank is a respectable actress, and 'Conviction' is a respectable movie. The story of Betty Anne Waters' efforts to free her brother Kenny from wrongful imprisonment, Swank's latest provides her with a character who like so many before her was determined to do something other people said she couldn't, or shouldn't do. But like the majority of the films those characters appeared in, 'Conviction' must be damned with faint praise, the sort of movie that serves as catnip to awards-season voters but eat-your-vegetables stuff to audiences thanks to its "true life" bona fides and execution that gives it the emotional satisfaction of an above-average segment on '60 Minutes.'