So glibc exposes a close_range() syscall wrapper now, but they decided to use "unsigned" as type for the fds. Which is a bit weird, because fds are universally understood to be "int". The kernel internally uses "unsigned", both for close() and for close_range(), but weirdly, userspace didn't fix that for close_range() unlike what they did for close()... Weird. But anyway, let's follow suit, and make our wrapper match glibc's. Fixes #31270
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