The functions require to be passed with a cpu index prior to one that is
the first to start search, so the valid input range is [-1, nr_cpu_ids-1).
However, the code checks against [-1, nr_cpu_ids).
Acked-by: NJakub Kicinski <kuba@kernel.org>
Signed-off-by: NYury Norov <yury.norov@gmail.com>