percpu: use pcpu_free_slot instead of pcpu_nr_slots - 1
This prepares for adding a to_depopulate list and sidelined list after the free slot in the set of lists in pcpu_slot. Signed-off-by: Dennis Zhou <dennis@kernel.org> Acked-by: Roman Gushchin <guro@fb.com> Signed-off-by: Dennis Zhou <dennis@kernel.org>
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8ea2e1e3
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