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Adjust the implementation of css_is_cgroup() so that it compares the given css to cgroup::self. Rename the function to css_is_self() in order to reflect that. Change the existing css->ss NULL check to a warning in the true branch. Finally, adjust call sites to use the new function name. Signed-off-by: JP Kobryn <inwardvessel@gmail.com> Signed-off-by: Tejun Heo <tj@kernel.org>