kref: double kref_put() in my_data_handler()

The kref_put() already occurs after the out label

Signed-off-by: Roel Kluin <roel.kluin@gmail.com>
Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>