[m-rev.] for post-commit review: shut up a C compiler warning

[Zoltan Somogyi]

I don't why it hasn't been a problem till now, but hard_coded/user_compare
fails without something like this. It works with my gcc, and I *think* it would
work with clang, but I have idea with which versions. Hence the request
for a review.

Zoltan.
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