fix dead store jmh bug

Author: wangjoshuah

core-api/src/test/java/com/optimizely/ab/bucketing/DecisionServiceTest.java

@@ -344,7 +344,6 @@ public void getVariationForFeatureReturnsVariationFromRolloutWhenExperimentFails
         Experiment featureExperiment = v4ProjectConfig.getExperimentIdMapping().get(featureFlag.getExperimentIds().get(0));
         assertNotNull(featureExperiment);
         Rollout featureRollout = v4ProjectConfig.getRolloutIdMapping().get(featureFlag.getRolloutId());
-        Variation experimentVariation = featureExperiment.getVariations().get(0);
         Variation rolloutVariation = featureRollout.getExperiments().get(0).getVariations().get(0);
 
         DecisionService decisionService = spy(new DecisionService(