Fix another signed/unsigned comparison in KontrollerTest.
Fix another signed/unsigned comparison in KontrollerTest.

Change-Id: Ie24bd82d9f151fd8b8605948096382f02e199677
Signed-off-by: Brandon Baker <a57ed95460e44c7b5dd675b778bcd98e47bd07ea@intel.com>

geopm/geopm,cmcantalupo/geopm,cmcantalupo/geopm,cmcantalupo/geopm,geopm/geopm,cmcantalupo/geopm,cmcantalupo/geopm,geopm/geopm,geopm/geopm,geopm/geopm