mdio_bus: fix devm_mdiobus_alloc_size export

commit 6d48f44b "mdio_bus: implement devm_mdiobus_alloc/devm_mdiobus_free"
introduced a new function devm_mdiobus_alloc_size() but added an export
for a different function devm_mdiobus_alloc(), which was obviously
a simple mistake that leads to  build error whenever this function is
used from a loadable module:

ERROR: "devm_mdiobus_alloc_size" [drivers/net/ethernet/ti/davinci_mdio.ko] undefined!
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Cc: Grygorii Strashko <grygorii.strashko@ti.com>
Cc: Florian Fainelli <f.fainelli@gmail.com>
Cc: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Cc: Lad, Prabhakar <prabhakar.csengg@gmail.com>
Cc: David S. Miller <davem@davemloft.net>
Cc: netdev@vger.kernel.org
Acked-by: Lad, Prabhakar <prabhakar.csengg@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/phy/mdio_bus.c

@@ -117,7 +117,7 @@ struct mii_bus *devm_mdiobus_alloc_size(struct device *dev, int sizeof_priv)
 
 	return bus;
 }
-EXPORT_SYMBOL_GPL(devm_mdiobus_alloc);
+EXPORT_SYMBOL_GPL(devm_mdiobus_alloc_size);
 
 /**
  * devm_mdiobus_free - Resource-managed mdiobus_free()