HDFS-17431. Fix log format for BlockRecoveryWorker#recoverBlocks (#6643)

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

@@ -628,7 +628,7 @@ public class BlockRecoveryWorker {
                 new RecoveryTaskContiguous(b).recover();
               }
             } catch (IOException e) {
-              LOG.warn("recover Block: {} FAILED: {}", b, e);
+              LOG.warn("recover Block: {} FAILED: ", b, e);
             }
           }
         } finally {