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While refactoring, f7b2814bb9b6 ("cgroup: factor out cgroup_{apply|finalize}_control() from cgroup_subtree_control_write()") broke error return value from the function. The return value from the last operation is always overridden to zero. Fix it. Signed-off-by: Tejun Heo <tj@kernel.org> Cc: stable@vger.kernel.org # v4.6+ Signed-off-by: Tejun Heo <tj@kernel.org>