tree 7f4b6e0f9b471a2c491b6c58f9b0c5e5926cf029
parent 5e0ead68ec0abca58b3c390f9ce7f1ddb78fa53a
author Daniel Mentz <danielmentz@google.com> 1481680223 -0800
committer Daniel Mentz <danielmentz@google.com> 1484074436 -0800

mdiobus_unregister(), mdiobus_register() symmetric

Only call mdiobus_unregister() if we previously called
mdiobus_register().