cgroup: fix uninitialized usage of a variable
It is possible that 'root' variable is used uninitialized. This
change avoids usage of uninitialized usage of the variable.
Change-Id: I9a3bd941a23736cb003f209cf6dde84fd859e9e6
Signed-off-by:
Jeevan Shriram <jshriram@codeaurora.org>
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