HDFS-10189. PacketResponder#toString should include the downstreams for PacketResponderType.HAS_DOWNSTREAM_IN_PIPELINE (Joe Pallas via cmccabe)

(cherry picked from commit a7d8f2b3960d27c74abb17ce2aa4bcd999706ad2)
(cherry picked from commit a68a9eb2b131e426ad16854e83ef81418442e989)

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/BlockReceiver.java

@@ -1146,7 +1146,7 @@ class BlockReceiver implements Closeable {
 
       final StringBuilder b = new StringBuilder(getClass().getSimpleName())
           .append(": ").append(block).append(", type=").append(type);
-      if (type != PacketResponderType.HAS_DOWNSTREAM_IN_PIPELINE) {
+      if (type == PacketResponderType.HAS_DOWNSTREAM_IN_PIPELINE) {
         b.append(", downstreams=").append(downstreams.length)
             .append(":").append(Arrays.asList(downstreams));
       }