[PATCH net-next] mdio_bus: Fix PTR_ERR() usage after initialization to constant

[YueHaibing]

Fix coccinelle warning:

./drivers/net/phy/mdio_bus.c:51:5-12: ERROR: PTR_ERR applied after initialization to constant on line 44
./drivers/net/phy/mdio_bus.c:52:5-12: ERROR: PTR_ERR applied after initialization to constant on line 44

fix this by using IS_ERR before PTR_ERR

Fixes: bafbdd527d56 ("phylib: Add device reset GPIO support")
Signed-off-by: YueHaibing <yuehaibing@xxxxxxxxxx>
---
 drivers/net/phy/mdio_bus.c | 13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

diff --git a/drivers/net/phy/mdio_bus.c b/drivers/net/phy/mdio_bus.c
index 3d31358..802716a 100644
--- a/drivers/net/phy/mdio_bus.c
+++ b/drivers/net/phy/mdio_bus.c
@@ -42,17 +42,20 @@
 static int mdiobus_register_gpiod(struct mdio_device *mdiodev)
 {
 	struct gpio_desc *gpiod = NULL;
+	int ret;
 
 	/* Deassert the optional reset signal */
 	if (mdiodev->dev.of_node)
 		gpiod = fwnode_get_named_gpiod(&mdiodev->dev.of_node->fwnode,
 					       "reset-gpios", 0, GPIOD_OUT_LOW,
 					       "PHY reset");
-	if (PTR_ERR(gpiod) == -ENOENT ||
-	    PTR_ERR(gpiod) == -ENOSYS)
-		gpiod = NULL;
-	else if (IS_ERR(gpiod))
-		return PTR_ERR(gpiod);
+	if (IS_ERR(gpiod)) {
+		ret = PTR_ERR(gpiod);
+		if (ret == -ENOENT || ret == -ENOSYS)
+			gpiod = NULL;
+		else
+			return ret;
+	}
 
 	mdiodev->reset = gpiod;
 
-- 
2.7.4