can: usb_8dev: unregister netdev before free()ing
The usb_8dev hardware has problems on some xhci USB hosts. The driver fails to read the firmware revision in the probe function. This leads to the following Oops: [ 3356.635912] kernel BUG at net/core/dev.c:5701! The driver tries to free the netdev, which has already been registered, without unregistering it. This patch fixes the problem by unregistering the netdev in the error path. Reported-by: NMichael Olbrich <m.olbrich@pengutronix.de> Reviewed-by: NBernd Krumboeck <krumboeck@universalnet.at> Signed-off-by: NMarc Kleine-Budde <mkl@pengutronix.de>
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