cgroup: fix pointer check in css_rstat_init()

In css_rstat_init() allocations are done for the cgroup's pointers
rstat_cpu and rstat_base_cpu. Make sure the allocation checks are
consistent with what they are allocating.

Signed-off-by: JP Kobryn <inwardvessel@gmail.com>
Signed-off-by: Tejun Heo <tj@kernel.org>