sky2: fix simple define thinko

noticed while browsing code, apparent thinko.  compile tested only.

Signed-off-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
CC: Stephen Hemminger <shemminger@linux-foundation.org>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>

drivers/net/sky2.h

@@ -1966,13 +1966,13 @@ struct sky2_status_le {
 struct tx_ring_info {
 	struct sk_buff	*skb;
 	DECLARE_PCI_UNMAP_ADDR(mapaddr);
-	DECLARE_PCI_UNMAP_ADDR(maplen);
+	DECLARE_PCI_UNMAP_LEN(maplen);
 };
 
 struct rx_ring_info {
 	struct sk_buff	*skb;
 	dma_addr_t	data_addr;
-	DECLARE_PCI_UNMAP_ADDR(data_size);
+	DECLARE_PCI_UNMAP_LEN(data_size);
 	dma_addr_t	frag_addr[ETH_JUMBO_MTU >> PAGE_SHIFT];
 };