drivers: dio: fix possible memory leak in dio_init()

In the Linux kernel, the following vulnerability has been resolved:

drivers: dio: fix possible memory leak in dio_init()

If device_register() returns error, the 'dev' and name needs be

freed. Add a release function, and then call put_device() in the

error path, so the name is freed in kobject_cleanup() and to the

'dev' is freed in release function.