pasemi_mac: fix typo

Add missing &:

drivers/net/pasemi_mac.c: In function 'pasemi_mac_clean_rx':
drivers/net/pasemi_mac.c:553: warning: passing argument 1 of 'prefetch'
makes pointer from integer without a cast

Signed-off-by: Olof Johansson <olof@lixom.net>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
diff --git a/drivers/net/pasemi_mac.c b/drivers/net/pasemi_mac.c
index 9f9a421..ab4d309 100644
--- a/drivers/net/pasemi_mac.c
+++ b/drivers/net/pasemi_mac.c
@@ -550,7 +550,7 @@
 
 	n = mac->rx->next_to_clean;
 
-	prefetch(RX_RING(mac, n));
+	prefetch(&RX_RING(mac, n));
 
 	for (count = 0; count < limit; count++) {
 		macrx = RX_RING(mac, n);