[PATCH net] of: mdio: Fix a signedness bug in of_phy_get_and_connect()

[Dan Carpenter]

The "iface" variable is an enum and in this context GCC treats it as
an unsigned int so the error handling is never triggered.

Fixes: b78624125304 ("of_mdio: Abstract a general interface for phy connect")
Signed-off-by: Dan Carpenter <dan.carpen...@oracle.com>
---
 drivers/of/of_mdio.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/of/of_mdio.c b/drivers/of/of_mdio.c
index 000b95787df1..bd6129db6417 100644
--- a/drivers/of/of_mdio.c
+++ b/drivers/of/of_mdio.c
@@ -362,7 +362,7 @@ struct phy_device *of_phy_get_and_connect(struct net_device 
*dev,
        int ret;
 
        iface = of_get_phy_mode(np);
-       if (iface < 0)
+       if ((int)iface < 0)
                return NULL;
        if (of_phy_is_fixed_link(np)) {
                ret = of_phy_register_fixed_link(np);
-- 
2.20.1