A few Saturdays ago, I re-watched Cliffhanger. Now, that's a movie. Why is its director, Renny Harlin, once a dependable big-action guru, making sub-schlock like The Covenant? This is cobbled-together teenybopper tripe about feuding male witches apparently they can't even be granted the manlier dignity of being called ''warlocks'' with nothing to offer but classic bad dialogue. The Bad Male Witch taunts the Good Male Witch by asking, ''How 'bout I make you my wee-yotch?'' Seriously, Renny Harlin: What are you doing?