[NET]: Fix build warning in ns83820 driver.

drivers/net/ns83820.c

@@ -1586,6 +1586,7 @@ static void ns83820_run_bist(struct ns83820 *dev, const char *name, u32 enable,
 	dprintk("%s: done %s in %d loops\n", dev->net_dev.name, name, loops);
 }
 
+#ifdef PHY_CODE_IS_FINISHED
 static void ns83820_mii_write_bit(struct ns83820 *dev, int bit)
 {
 	/* drive MDC low */
@@ -1758,6 +1759,7 @@ static void ns83820_probe_phy(struct ns83820 *dev)
 		dprintk("version: 0x%04x 0x%04x\n", a, b);
 	}
 }
+#endif
 
 static int __devinit ns83820_init_one(struct pci_dev *pci_dev, const struct pci_device_id *id)
 {