sis900_mii_probe() must be __devinit

This patch fixes the following section mismatch:

<--  snip  -->

...
  MODPOST vmlinux
WARNING: drivers/built-in.o(.text+0x298170): Section mismatch: reference to .init.text:sis900_mii_probe (between 'sis900_probe' and 'sis900_default_phy')
...

<--  snip  -->
Signed-off-by: NAdrian Bunk <bunk@stusta.de>
Signed-off-by: NJeff Garzik <jeff@garzik.org>

drivers/net/sis900.c

@@ -573,7 +573,7 @@ static int __devinit sis900_probe(struct pci_dev *pci_dev,
  *	return error if it failed to found.
  */
 
-static int __init sis900_mii_probe(struct net_device * net_dev)
+static int __devinit sis900_mii_probe(struct net_device * net_dev)
 {
 	struct sis900_private * sis_priv = net_dev->priv;
 	const char *dev_name = pci_name(sis_priv->pci_dev);