ibmveth: Checksum offload is always disabled

Commit b9367bf3 (net: ibmveth: convert to hw_features) reversed
a check in ibmveth_set_csum_offload that results in checksum offload
never being enabled.
Signed-off-by: NAnton Blanchard <anton@samba.org>
Cc: <stable@kernel.org> # 3.0+
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/ibmveth.c

@@ -812,7 +812,7 @@ static int ibmveth_set_csum_offload(struct net_device *dev, u32 data)
 		} else
 			adapter->fw_ipv6_csum_support = data;
 
-		if (ret != H_SUCCESS || ret6 != H_SUCCESS)
+		if (ret == H_SUCCESS || ret6 == H_SUCCESS)
 			adapter->rx_csum = data;
 		else
 			rc1 = -EIO;