TITLE: THE BODYGUARD
DIRECTOR: MICK JACKSON
WRITER: LAWRENCE KASDAN
THE BOTTOM LINE: The suspense is mild, the sexual heat is low, but Whitney Houston's screen debut has its charms.
She is an insolent kitten, a whimsical promise of claws and cuddles. He is a Doberman in a nondescript suit, a deadly compound of wariness and instant reactions. Less fancifully, she's Rachel Marron (Whitney Houston, playing what she is, a pop diva crossing over to the movies, though it's unlikely that she will be up for an Oscar the first time out, as is the fictional Rachel). He's Frank Farmer (Kevin Costner),...