qla3xxx: Remove unnecessary memset() in qla3xxx_send()

We do not need to zero out the 64 byte MAC request I/O control block.
  By zeroing out the control block and setting it to proper fields is
redundant work.  This is because in the qla3xxx_send() function we will
already set the proper fields in this structure.  The unused fields are
not looked at by the hardware and do not need to be zeroed out.
Signed-off-by: Benjamin Li <benjamin.li@qlogic.com>
Signed-off-by: Ron Mercer <ron.mercer@qlogic.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

drivers/net/qla3xxx.c

@@ -2188,7 +2188,6 @@ static int ql3xxx_send(struct sk_buff *skb, struct net_device *ndev)
 
 	}
 	mac_iocb_ptr = tx_cb->queue_entry;
-	memset((void *)mac_iocb_ptr, 0, sizeof(struct ob_mac_iocb_req));
 	mac_iocb_ptr->opcode = qdev->mac_ob_opcode;
 	mac_iocb_ptr->flags |= qdev->mb_bit_mask;
 	mac_iocb_ptr->transaction_id = qdev->req_producer_index;