This is needed for the rbtree, and we shouldn't just rely
on it getting included somewhere implicitly. Include it
explicitly.
Acked-by: NToke Høiland-Jørgensen <toke@redhat.com>
Link: https://lore.kernel.org/r/20210715180234.512d64dee655.Ia51c29a9fb1e651e06bc00eabec90974103d333e@changeidSigned-off-by: NJohannes Berg <johannes.berg@intel.com>