cgroup: fix cgroup_css() invocation in css_from_id()
ca8bdcaf ("cgroup: make cgroup_css() take cgroup_subsys * instead and allow NULL subsys") missed one conversion in css_from_id(), which was newly added. As css_from_id() doesn't have any user yet, this doesn't break anything other than generating a build warning. Convert it. Signed-off-by: NTejun Heo <tj@kernel.org> Reported-by: NStephen Rothwell <sfr@canb.auug.org.au> Reported-by: Nkbuild test robot <fengguang.wu@intel.com>
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