Fix possible NPE when matching accessory version

As UsbAccessory#getVersion is nullable, a NPE can occur if the manufacturer/model match.

Bug: 172002066
Bug: 178227159
Bug: 180055624
Change-Id: I751a01e3d182e01e5a9dbc011b60535997f9bc15
(cherry picked from commit 25dca30e2f1fe1a25a6ae0b9ad556902cf722d46)
1 file changed