fix checkstyle

Author: LiuGuH

hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/DFSOutputStream.java

@@ -340,7 +340,7 @@ static DFSOutputStream newStreamForCreate(DFSClient dfsClient, String src,
 
   /** Construct a new output stream for append. */
   private DFSOutputStream(DFSClient dfsClient, String src,
-      EnumSet<CreateFlag> flags, Progressable progress, LocatedBlock userAssignmentLastBlock,
+      EnumSet<CreateFlag> flags, Progressable progress, LocatedBlock lastBlock,
       HdfsFileStatus stat, DataChecksum checksum, String[] favoredNodes)
       throws IOException {
     this(dfsClient, src, flags, progress, stat, checksum);
@@ -352,18 +352,18 @@ private DFSOutputStream(DFSClient dfsClient, String src,
     this.fileEncryptionInfo = stat.getFileEncryptionInfo();
 
     // The last partial block of the file has to be filled.
-    if (!toNewBlock && userAssignmentLastBlock != null) {
+    if (!toNewBlock && lastBlock != null) {
       // indicate that we are appending to an existing block
-      streamer = new DataStreamer(userAssignmentLastBlock, stat, dfsClient, src, progress,
+      streamer = new DataStreamer(lastBlock, stat, dfsClient, src, progress,
           checksum, cachingStrategy, byteArrayManager);
-      getStreamer().setBytesCurBlock(userAssignmentLastBlock.getBlockSize());
-      adjustPacketChunkSize(userAssignmentLastBlock);
-      getStreamer().setPipelineInConstruction(userAssignmentLastBlock);
+      getStreamer().setBytesCurBlock(lastBlock.getBlockSize());
+      adjustPacketChunkSize(lastBlock);
+      getStreamer().setPipelineInConstruction(lastBlock);
     } else {
       computePacketChunkSize(dfsClient.getConf().getWritePacketSize(),
           bytesPerChecksum);
       streamer = new DataStreamer(stat,
-          userAssignmentLastBlock != null ? userAssignmentLastBlock.getBlock() : null, dfsClient, src,
+          lastBlock != null ? lastBlock.getBlock() : null, dfsClient, src,
           progress, checksum, cachingStrategy, byteArrayManager, favoredNodes,
           addBlockFlags);
     }