[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 <yuehaib...@huawei.com>
---
 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