defxx: Use __maybe_unused rather than a local hack

 This is a change to remove a local hack in favour to __maybe_unused that
has been recently added.
Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

drivers/net/defxx.c

@@ -200,6 +200,7 @@
 
 /* Include files */
 #include <linux/bitops.h>
+#include <linux/compiler.h>
 #include <linux/delay.h>
 #include <linux/dma-mapping.h>
 #include <linux/eisa.h>
@@ -240,8 +241,6 @@ static char version[] __devinitdata =
  */
 #define NEW_SKB_SIZE (PI_RCV_DATA_K_SIZE_MAX+128)
 
-#define __unused __attribute__ ((unused))
-
 #ifdef CONFIG_PCI
 #define DFX_BUS_PCI(dev) (dev->bus == &pci_bus_type)
 #else
@@ -375,7 +374,7 @@ static inline void dfx_outl(DFX_board_t *bp, int offset, u32 data)
 
 static void dfx_port_write_long(DFX_board_t *bp, int offset, u32 data)
 {
-	struct device __unused *bdev = bp->bus_dev;
+	struct device __maybe_unused *bdev = bp->bus_dev;
 	int dfx_bus_tc = DFX_BUS_TC(bdev);
 	int dfx_use_mmio = DFX_MMIO || dfx_bus_tc;
 
@@ -399,7 +398,7 @@ static inline void dfx_inl(DFX_board_t *bp, int offset, u32 *data)
 
 static void dfx_port_read_long(DFX_board_t *bp, int offset, u32 *data)
 {
-	struct device __unused *bdev = bp->bus_dev;
+	struct device __maybe_unused *bdev = bp->bus_dev;
 	int dfx_bus_tc = DFX_BUS_TC(bdev);
 	int dfx_use_mmio = DFX_MMIO || dfx_bus_tc;
 
@@ -866,7 +865,7 @@ static void __devinit dfx_bus_uninit(struct net_device *dev)
 
 static void __devinit dfx_bus_config_check(DFX_board_t *bp)
 {
-	struct device __unused *bdev = bp->bus_dev;
+	struct device __maybe_unused *bdev = bp->bus_dev;
 	int dfx_bus_eisa = DFX_BUS_EISA(bdev);
 	int	status;				/* return code from adapter port control call */
 	u32	host_data;			/* LW data returned from port control call */
@@ -3624,8 +3623,8 @@ static void __devexit dfx_unregister(struct device *bdev)
 }
 
 
-static int __devinit __unused dfx_dev_register(struct device *);
-static int __devexit __unused dfx_dev_unregister(struct device *);
+static int __devinit __maybe_unused dfx_dev_register(struct device *);
+static int __devexit __maybe_unused dfx_dev_unregister(struct device *);
 
 #ifdef CONFIG_PCI
 static int __devinit dfx_pci_register(struct pci_dev *,
@@ -3699,7 +3698,7 @@ static struct tc_driver dfx_tc_driver = {
 };
 #endif /* CONFIG_TC */
 
-static int __devinit __unused dfx_dev_register(struct device *dev)
+static int __devinit __maybe_unused dfx_dev_register(struct device *dev)
 {
 	int status;
 
@@ -3709,7 +3708,7 @@ static int __devinit __unused dfx_dev_register(struct device *dev)
 	return status;
 }
 
-static int __devexit __unused dfx_dev_unregister(struct device *dev)
+static int __devexit __maybe_unused dfx_dev_unregister(struct device *dev)
 {
 	put_device(dev);
 	dfx_unregister(dev);