Fixes sign compares in MSRIOGroupTest
Fixes sign compares in MSRIOGroupTest

Change-Id: I61e5045fdfa40ec3e20aa7fd135a192e4ec51010
Signed-off-by: Christopher M. Cantalupo <9cf3ecca60a3dd7112ab0e7250bedb8a752e3958@intel.com>

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