[PATCH net] net: ethernet: stmmac: Fix signedness bug in ipq806x_gmac_of_parse()

[Dan Carpenter]

The "gmac->phy_mode" variable is an enum and in this context GCC will
treat it as an unsigned int so the error handling will never be
triggered.

Fixes: b1c17215d718 ("stmmac: add ipq806x glue layer")
Signed-off-by: Dan Carpenter <dan.carpen...@oracle.com>
---
 drivers/net/ethernet/stmicro/stmmac/dwmac-ipq806x.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-ipq806x.c 
b/drivers/net/ethernet/stmicro/stmmac/dwmac-ipq806x.c
index 2c6d7c69c8f7..0d21082ceb93 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac-ipq806x.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-ipq806x.c
@@ -191,7 +191,7 @@ static int ipq806x_gmac_of_parse(struct ipq806x_gmac *gmac)
        struct device *dev = &gmac->pdev->dev;
 
        gmac->phy_mode = of_get_phy_mode(dev->of_node);
-       if (gmac->phy_mode < 0) {
+       if ((int)gmac->phy_mode < 0) {
                dev_err(dev, "missing phy mode property\n");
                return -EINVAL;
        }
-- 
2.20.1