cgroup: add sparse annotation to cgroup_iter_start() and cgroup_iter_end()

Signed-off-by: Kirill A. Shutemov <kirill@shutemov.name>
Acked-by: Li Zefan <lizf@cn.fujitsu.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
1 file changed