In CHANGES.txt, move HDFS-9294 to Release 2.6.4.

hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt

@@ -1837,9 +1837,6 @@ Release 2.7.2 - UNRELEASED
     HDFS-9426. Rollingupgrade finalization is not backward compatible
     (Kihwal Lee via vinayakumarb)
 
-    HDFS-9294. DFSClient deadlock when close file and failed to renew lease.
-    (Brahma Reddy Battula via szetszwo)
-
     HDFS-9445. Datanode may deadlock while handling a bad volume.
     (Wlater Su via Kihwal)
 
@@ -2900,6 +2897,9 @@ Release 2.6.4 - UNRELEASED
     HDFS-9600. do not check replication if the block is under construction
     (Phil Yang via vinayakumarb)
 
+    HDFS-9294. DFSClient deadlock when close file and failed to renew lease.
+    (Brahma Reddy Battula via szetszwo)
+
 Release 2.6.3 - 2015-12-17
 
   INCOMPATIBLE CHANGES