6541631: (fc) java/nio/channels/Filechannel/LongTransferTest.java should clean up after itself

Should close the channel before delete the file

Reviewed-by: alanb

jdk/test/java/nio/channels/FileChannel/LongTransferTest.java

@@ -22,7 +22,7 @@
  */
 
 /* @test
-   @bug 5105464 6269047
+   @bug 5105464 6269047 6541631
  * @summary Test to transfer bytes with a size bigger than Integer.MAX_VALUE
  */
 
@@ -81,9 +81,11 @@ public class LongTransferTest {
         System.out.println("LongTransferTest-main: OK!");
 
         socket.close();
-
         server.close();
 
+        inChannel.close();
+        outChannel.close();
+
         inFile.delete();
         outFile.delete();
     }