[PATCH] fix net/ixgb/ixgb_main.c warning

From: "Luiz Fernando N. Capitulino" <lcapitulino@prefeitura.sp.gov.br>

drivers/net/ixgb/ixgb_main.c: In function `ixgb_intr':
drivers/net/ixgb/ixgb_main.c:1593: warning: unused variable `hw'
(catch by J. Cherry).

This happens because `hw' is only used when CONFIG_IXGB_NAPI is not set.
As `hw' is used only to have the code readable, we can use it for
!CONFIG_IXGB_NAPI too.
Signed-off-by: Andrew Morton <akpm@osdl.org>

drivers/net/ixgb/ixgb_main.c

@@ -1610,7 +1610,7 @@ static irqreturn_t ixgb_intr(int irq, void *data, struct pt_regs *regs)
 		 */
 
 		atomic_inc(&adapter->irq_sem);
-		IXGB_WRITE_REG(&adapter->hw, IMC, ~0);
+		IXGB_WRITE_REG(hw, IMC, ~0);
 		__netif_rx_schedule(netdev);
 	}
 #else