xen-netback: do not report success if backend_create_xenvif() fails
If xenvif_alloc() or xenbus_scanf() fail in backend_create_xenvif(), xenbus is left in offline mode but netback_probe() reports success. The patch implements propagation of error code for backend_create_xenvif(). Found by Linux Driver Verification project (linuxtesting.org). Signed-off-by: NAlexey Khoroshilov <khoroshilov@ispras.ru> Acked-by: NWei Liu <wei.liu2@citrix.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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