net: phy: Properly define genphy_c45_driver

Avoid the W=1 warning that symbol 'genphy_c45_driver' was not
declared. Should it be static?

Declare it on the phy header file.
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/phy/phy_device.c

@@ -227,7 +227,6 @@ static void phy_mdio_device_remove(struct mdio_device *mdiodev)
 }
 
 static struct phy_driver genphy_driver;
-extern struct phy_driver genphy_c45_driver;
 
 static LIST_HEAD(phy_fixup_list);
 static DEFINE_MUTEX(phy_fixup_lock);

include/linux/phy.h

@@ -1385,6 +1385,9 @@ int genphy_c45_pma_read_abilities(struct phy_device *phydev);
 int genphy_c45_read_status(struct phy_device *phydev);
 int genphy_c45_config_aneg(struct phy_device *phydev);
 
+/* Generic C45 PHY driver */
+extern struct phy_driver genphy_c45_driver;
+
 /* The gen10g_* functions are the old Clause 45 stub */
 int gen10g_config_aneg(struct phy_device *phydev);