HBASE-19199 RatioBasedCompactionPolicy#shouldPerformMajorCompaction() always return true when only one file needs to compact

Signed-off-by: tedyu <yuzhihong@gmail.com>

hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/compactions/RatioBasedCompactionPolicy.java

@@ -106,8 +106,8 @@ public class RatioBasedCompactionPolicy extends SortedCompactionPolicy {
       } else {
         LOG.debug("Major compaction triggered on store " + regionInfo
           + "; time since last major compaction " + (now - lowTimestamp) + "ms");
+        result = true;
       }
-      result = true;
     }
     return result;
   }