A review of the new sci-fi/horror drama, at Fantasia Festival — That Rahul Kohli sure is a charming rascal, isn’t he? Internet boyfriend status aside, the man’s just really good at what he does. Case in point: Next Exit, writer-director Mali Elfman’s new uncategorizable film. Part horror movie, part road-trip comedy, and part sci-fi, Next Exit is also a drama about…