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In function cgroup_base_stat_flush(), we update cgroup_base_stat by
getting rstatc->bstat and adjust delta to related fields.

There are two convention to assign cgroup_base_stat in this function:

  * rstat2 = rstat1
  * rstat2.cputime = rstat1.cputime

The second convention may make audience think just field "cputime" is
updated, while cputime is the only field in cgroup_base_stat.

Let's use the same convention to eliminate this confusion.
Signed-off-by: Wei Yang <richard.weiyang@gmail.com>
Signed-off-by: Tejun Heo <tj@kernel.org>