s390/qeth: Remove QETH_IP_HEADER_SIZE

Remove unused define QETH_IP_HEADER_SIZE.

Signed-off-by: Julian Wiedmann <jwi@linux.vnet.ibm.com>
Reviewed-by: Thomas Richter <tmricht@linux.vnet.ibm.com>
Acked-by: Ursula Braun <ubraun@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/s390/net/qeth_core.h

@@ -281,8 +281,6 @@ static inline int qeth_is_ipa_enabled(struct qeth_ipa_info *ipa,
 #define QETH_HIGH_WATERMARK_PACK 5
 #define QETH_WATERMARK_PACK_FUZZ 1
 
-#define QETH_IP_HEADER_SIZE 40
-
 /* large receive scatter gather copy break */
 #define QETH_RX_SG_CB (PAGE_SIZE >> 1)
 #define QETH_RX_PULL_LEN 256