A call usb_put_phy(udc->transceiver) must be tested for a valid pointer.
Use an already existing test for usb_unregister_notifier call.
Acked-by: NRobert Jarzmik <robert.jarzmik@free.fr>
Reported-by: NRobert Jarzmik <robert.jarzmik@free.fr>
Signed-off-by: NPetr Cvek <petr.cvek@tul.cz>
Signed-off-by: NFelipe Balbi <felipe.balbi@linux.intel.com>