cpmac: use after free

The original code dereferenced "cpmac_mii" after calling
"mdiobus_free(cpmac_mii);"

Signed-off-by: Dan Carpenter <error27@gmail.com>
Reviewed-by: Jiri Pirko <jpirko@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/cpmac.c

@@ -1290,8 +1290,8 @@ void __devexit cpmac_exit(void)
 {
 	platform_driver_unregister(&cpmac_driver);
 	mdiobus_unregister(cpmac_mii);
-	mdiobus_free(cpmac_mii);
 	iounmap(cpmac_mii->priv);
+	mdiobus_free(cpmac_mii);
 }
 
 module_init(cpmac_init);