Nahh, it'll be fine. It's the amount of priming sugar that determines the level of carbonation, not the amount of yeast. Extra yeast or trub might lead to a cloudy beer that takes more refrigeration to clear, but it'll be just fine. Worst case scenario, it never gets crystal clear, but it still drinkable beer.
Stand by for the obligatory "It's ruined, mail it to me for proper disposal" post.