net: ucc_geth: fix build failure

My series to fix the reference counting of dt nodes introduced a build
failure. Fix it.

Fixes: fa310789

 ("net: ucc_geth: drop acquired references in probe error path and remove")
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: David S. Miller <davem@davemloft.net>