Surprised at all the people saying no, really doesn't look like much damage from the entirety of the steerer tube. I would epoxy the piece down, lightly sand it smooth and never give it another thought. If it takes that tiny amount of damage to a steerer tube to make it completely unsafe and unusable then how do any of you ever feel comfortable riding on a carbon fork? That doesn't even effect the overall structure of the layers its a part of as those are still bonded the other 98% of the way around and doesn't even go the full length of the tube.