Documentation: mdio_bus.c - fix warnings

Fix wrong parameter description and related warnings at 'make htmldocs'.

Signed-off-by: Lothar Rubusch <l.rubusch@gmail.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Acked-by: Randy Dunlap <rdunlap@infradead.org>
Tested-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/phy/mdio_bus.c

@@ -464,7 +464,7 @@ static struct class mdio_bus_class = {
 
 /**
  * mdio_find_bus - Given the name of a mdiobus, find the mii_bus.
- * @mdio_bus_np: Pointer to the mii_bus.
+ * @mdio_name: The name of a mdiobus.
  *
  * Returns a reference to the mii_bus, or NULL if none found.  The
  * embedded struct device will have its reference count incremented,