Revert "kref: double kref_put() in my_data_handler()"

This reverts commit 8f1ecc9fbc5b223e4f5d5bb8bcd6f5672c4bc4b6.

The correction is incorrect, see discussion at

http://stackoverflow.com/questions/20093127/why-kref-doc-of-linux-kernel-omits-kref-put-when-kthread-run-fail

Reported-by: KrishnamRaju raju <ekraju@gmail.com>
Cc: Roel Kluin <roel.kluin@gmail.com>
Cc: Randy Dunlap <randy.dunlap@oracle.com>
Cc: KrishnamRaju raju <ekraju@gmail.com>
Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Documentation/kref.txt

@@ -84,6 +84,7 @@ int my_data_handler(void)
 	task = kthread_run(more_data_handling, data, "more_data_handling");
 	if (task == ERR_PTR(-ENOMEM)) {
 		rv = -ENOMEM;
+	        kref_put(&data->refcount, data_release);
 		goto out;
 	}