Fixed UNUSED

Fixed UNUSED

Replaced obsolete syntax of __attribute__((unused)) in the middle of
parameter declarations (which is no longer supported by GCC 3.1) by the
current syntax (attribute at the end). Thanks to pixel@mandrakesoft.com
for reporting this problem.
git-archimport-id: mj@ucw.cz--public/pciutils--main--2.2--patch-4