fix checkstyle

Author: KeeProMise

hadoop-hdfs-project/hadoop-hdfs-rbf/src/main/java/org/apache/hadoop/hdfs/server/federation/router/async/AsyncForEachRun.java

@@ -181,4 +181,3 @@ public AsyncForEachRun<I, R> asyncDo(AsyncBiFunction<AsyncForEachRun<I, R>, I, R
     return this;
   }
 }
-

hadoop-hdfs-project/hadoop-hdfs-rbf/src/main/java/org/apache/hadoop/hdfs/server/federation/router/async/AsyncRun.java

@@ -72,4 +72,3 @@ default CompletableFuture<R> async() throws IOException {
     return completableFuture;
   }
 }
-

hadoop-hdfs-project/hadoop-hdfs-rbf/src/main/java/org/apache/hadoop/hdfs/server/federation/router/async/AsyncUtil.java

@@ -378,4 +378,3 @@ public static <I, R, P> void asyncCurrent(
     CUR_COMPLETABLE_FUTURE.set((CompletableFuture<Object>) result);
   }
 }
-

hadoop-hdfs-project/hadoop-hdfs-rbf/src/main/java/org/apache/hadoop/hdfs/server/federation/router/async/CatchFunction.java

@@ -115,4 +115,4 @@ default CompletableFuture<R> apply(
       throw (RuntimeException)e;
     });
   }
-}
+}

hadoop-hdfs-project/hadoop-hdfs-rbf/src/main/java/org/apache/hadoop/hdfs/server/federation/router/async/FinallyFunction.java

@@ -93,4 +93,3 @@ default CompletableFuture<R> apply(CompletableFuture<R> in) {
     });
   }
 }
-

hadoop-hdfs-project/hadoop-hdfs-rbf/src/test/java/org/apache/hadoop/hdfs/server/federation/router/async/AsyncClass.java

@@ -246,5 +246,4 @@ public String timeConsumingMethod(int input) {
     Async.CUR_COMPLETABLE_FUTURE.set(result);
     return null;
   }
-
 }

hadoop-hdfs-project/hadoop-hdfs-rbf/src/test/java/org/apache/hadoop/hdfs/server/federation/router/async/TestAsyncUtil.java

@@ -274,4 +274,4 @@ private < E extends Throwable> void checkException(
       });
     }
   }
-}
+}