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It's hard to say. Ever free download (be it a giveaway or an illegal download) is one less potential sale for that book in most cases. Not many are going to buy a paperback after reading the e-book.
But there's no way to really know how many who got the download would have ever bought the paperback in the first place. Then you also have little way to know how many people end up buying other books (be it paper books or e-books) from that author after reading one book for free (legally or illegally).
So in short, there's no real way to answer your question with much certainty.
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