[PATCH net] net: stmmac: dwmac-meson8b: Fix signedness bug in probe

[Dan Carpenter]

The "dwmac->phy_mode" is an enum and in this context GCC treats it as
an unsigned int so the error handling is never triggered.

Fixes: 566e82516253 ("net: stmmac: add a glue driver for the Amlogic Meson 8b / 
GXBB DWMAC")
Signed-off-by: Dan Carpenter <dan.carpen...@oracle.com>
---
 drivers/net/ethernet/stmicro/stmmac/dwmac-meson8b.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-meson8b.c 
b/drivers/net/ethernet/stmicro/stmmac/dwmac-meson8b.c
index 9cda29e4b89d..306da8f6b7d5 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac-meson8b.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-meson8b.c
@@ -339,7 +339,7 @@ static int meson8b_dwmac_probe(struct platform_device *pdev)
 
        dwmac->dev = &pdev->dev;
        dwmac->phy_mode = of_get_phy_mode(pdev->dev.of_node);
-       if (dwmac->phy_mode < 0) {
+       if ((int)dwmac->phy_mode < 0) {
                dev_err(&pdev->dev, "missing phy-mode property\n");
                ret = -EINVAL;
                goto err_remove_config_dt;
-- 
2.20.1