YARN-11515. Fix CheckStyle.

Author: slfan1989

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-router/src/main/java/org/apache/hadoop/yarn/server/router/clientrm/DefaultClientRequestInterceptor.java

@@ -116,12 +116,11 @@ public class DefaultClientRequestInterceptor
   @Override
   public void init(String userName) {
     super.init(userName);
-
-    final Configuration conf = this.getConf();
     try {
-      clientRMProxy =
-          user.doAs((PrivilegedExceptionAction<ApplicationClientProtocol>) () ->
-          ClientRMProxy.createRMProxy(conf, ApplicationClientProtocol.class));
+      final Configuration conf = this.getConf();
+      clientRMProxy = user.doAs(
+          (PrivilegedExceptionAction<ApplicationClientProtocol>) () ->
+               ClientRMProxy.createRMProxy(conf, ApplicationClientProtocol.class));
     } catch (Exception e) {
       String message = "Error while creating Router RMClient Service";
       if (user != null) {