How much non-salary income do computer science professors make in the United States?
No, there has been no survey of CS professors' non-salary incomes. We can't prove a negative, but you and I both, and presumably others here, have tried to look it up and found nothing. The likeliest reason is that the research has not yet been done.

Despite the highly upvoted comment about the information being useless, if anyone reading this is interested in performing the income study, I will volunteer to be one of the datapoints.