cgroup: s/cgrp_dfl_root_/cgrp_dfl_/

These var names are unnecessarily unwiedly and another similar
variable will be added.  Let's shorten them.

Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Tejun Heo 2016-02-23 10:00:50 -05:00
commit a716526442