Driver core: platform_device_unregister should release resources first
             and only then call device_unregister, otherwise if there
             are no more references to the device it will be freed and
             the fucntion will try to access freed memory.
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>