cgroup: Simplify cgroup_ancestor
Simplify cgroup_ancestor function. This is follow-up for commit 77236281 ("bpf: Introduce bpf_skb_ancestor_cgroup_id helper") Suggested-by:Tejun Heo <tj@kernel.org> Signed-off-by:
Andrey Ignatov <rdna@fb.com> Signed-off-by:
Tejun Heo <tj@kernel.org>
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