s390/qeth: indicate error when netdev allocation fails
Bailing out on allocation error is nice, but we also need to tell the ccwgroup core that creating the qeth groupdev failed. Fixes: d3d1b205 ("s390/qeth: allocate netdevice early") Signed-off-by: NJulian Wiedmann <jwi@linux.ibm.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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