net: of_mdio: use PHY_MAX_ADDR constant

Use the PHY_MAX_ADDR constant for checking if a MDIO bus address is
valid instead of using a plain "32".

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/of/of_mdio.c b/drivers/of/of_mdio.c
index 82485d2..f93ebca 100644
--- a/drivers/of/of_mdio.c
+++ b/drivers/of/of_mdio.c
@@ -107,7 +107,7 @@
 		}
 
 		addr = be32_to_cpup(paddr);
-		if (addr >= 32) {
+		if (addr >= PHY_MAX_ADDR) {
 			dev_err(&mdio->dev, "%s PHY address %i is too large\n",
 				child->full_name, addr);
 			continue;