cgroup: fix incorrect destination cgroup in cgroup_update_dfl_csses()
cgroup_update_dfl_csses() should move each task in the subtree to
self; however, it was incorrectly calling cgroup_migrate_add_src()
with the root of the subtree as @dst_cgrp. Fortunately,
cgroup_migrate_add_src() currently uses @dst_cgrp only to determine
the hierarchy and the bug doesn't cause any actual breakages. Fix it.
Signed-off-by: NTejun Heo <tj@kernel.org>
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