ZOOKEEPER-4350: improve the method: QuorumOracleMaj#overrideQuorumDecision

ZOOKEEPER-4350 - improve the method: QuorumOracleMaj#overrideQuorumDecision

Author: gopalbala <balasubramaniangopalakrishnan@gmail.com>

Reviewers: maoling <maoling@apache.org>

Closes #1750 from gopalbala/ZOOKEEPER-4350

zookeeper-server/src/main/java/org/apache/zookeeper/server/quorum/flexible/QuorumOracleMaj.java

@@ -115,11 +115,7 @@ public class QuorumOracleMaj extends QuorumMaj {
 
     @Override
     public boolean overrideQuorumDecision(List<LearnerHandler> forwardingFollowers) {
-        if (updateNeedOracle(forwardingFollowers) && askOracle()) {
-            return true;
-        } else {
-            return false;
-        }
+        return updateNeedOracle(forwardingFollowers) && askOracle();
     }
 
     @Override