HADOOP-15733. Correct the log when Invalid emptier Interval configured. Contributed by Ayush Saxena

(cherry picked from commit ef5c776a42697fb3958a77646b759e2a6edfe48e)

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/TrashPolicyDefault.java

@@ -249,7 +249,7 @@ public class TrashPolicyDefault extends TrashPolicy {
       LOG.info("Namenode trash configuration: Deletion interval = "
           + (deletionInterval / MSECS_PER_MINUTE)
           + " minutes, Emptier interval = "
-          + (emptierInterval / MSECS_PER_MINUTE) + " minutes.");
+          + (this.emptierInterval / MSECS_PER_MINUTE) + " minutes.");
     }
 
     @Override