gfar: Fix modpost warning

Fix the following modpost warning:

WARNING: vmlinux.o(.init.text+0x1aa6c): Section mismatch: reference to .exit.text:gfar_mdio_exit (between 'gfar_init' and 'gfar_mdio_init')
Signed-off-by: NKumar Gala <galak@kernel.crashing.org>
Signed-off-by: NJeff Garzik <jeff@garzik.org>

drivers/net/gianfar_mii.c

@@ -245,7 +245,7 @@ int __init gfar_mdio_init(void)
 	return driver_register(&gianfar_mdio_driver);
 }
 
-void __exit gfar_mdio_exit(void)
+void gfar_mdio_exit(void)
 {
 	driver_unregister(&gianfar_mdio_driver);
 }

drivers/net/gianfar_mii.h

@@ -42,5 +42,5 @@ struct gfar_mii {
 int gfar_mdio_read(struct mii_bus *bus, int mii_id, int regnum);
 int gfar_mdio_write(struct mii_bus *bus, int mii_id, int regnum, u16 value);
 int __init gfar_mdio_init(void);
-void __exit gfar_mdio_exit(void);
+void gfar_mdio_exit(void);
 #endif /* GIANFAR_PHY_H */