cgroup: remove an unused parameter from cgroup_task_migrate()
cgroup_task_migrate() no longer uses @old_cgrp. Remove it.
Signed-off-by: NTejun Heo <tj@kernel.org>
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cgroup_task_migrate() no longer uses @old_cgrp. Remove it.
Signed-off-by: NTejun Heo <tj@kernel.org>