usb: gadget: f_rndis: Avoid to use ERROR macro if cdev can be null

usb: gadget: f_rndis: Avoid to use ERROR macro if cdev can be null

The udc_irq service runs the isr_tr_complete_handler which in turn
"nukes" the endpoints, including a call to rndis_response_complete,
if appropriate. If the rndis_msg_parser fails here, an error will
be printed using a dev_err call (through the ERROR() macro).

However, if the usb cable was just disconnected the device (cdev)
might not be available and will be null. Since the dev_err macro will
dereference the cdev pointer we get a null pointer exception.

Reviewed-by: Radovan Lekanovic <[email protected]>
Signed-off-by: Truls Bengtsson <[email protected]>
Signed-off-by: Oskar Andero <[email protected]>
Acked-by: Michal Nazarewicz <[email protected]>
Signed-off-by: Felipe Balbi <[email protected]>