[Bug 209661] amd64_set_ioperm overflow

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=209661

--- Comment #2 from CTurt <cturt at hardenedbsd.org> ---
Sorry, I made a mistake in my report; the bound check is incorrect, as
described, however, no negative array index will occur from this since an
unsigned comparison is used in the loop. The impact is simply that `0` will be
returned instead of `EINVAL`.

This patch is good because unsigned is more appropriate for `i`, however it
doesn't fix the bug.

An additional patch should be applied to validate user arguments more
effectively than the current bound check, so that the arguments I posted
originally will no longer be accepted.

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