s390/qeth: disregard IPv4 header for RX csum offload

The kernel does its own validation of the IPv4 header checksum,
drivers/HW are not required to handle this.

Signed-off-by: Julian Wiedmann <jwi@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/s390/net/qeth_core.h

@@ -868,7 +868,6 @@ static inline void qeth_rx_csum(struct qeth_card *card, struct sk_buff *skb,
 				u8 flags)
 {
 	if ((card->dev->features & NETIF_F_RXCSUM) &&
-	    (flags & QETH_HDR_EXT_CSUM_HDR_REQ) &&
 	    (flags & QETH_HDR_EXT_CSUM_TRANSP_REQ))
 		skb->ip_summed = CHECKSUM_UNNECESSARY;
 	else