watchdog: wdat_wdt: fix return value check in wdat_wdt_probe()

In case of error, the function devm_ioremap_resource() returns ERR_PTR()
and never returns NULL. The NULL test in the return value check should
be replaced with IS_ERR().

Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com>
Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

1 files changed, 4 insertions, 3 deletions

diff --git a/drivers/watchdog/wdat_wdt.c b/drivers/watchdog/wdat_wdt.c
index 6b6464596674..4594723c27ba 100644
--- a/drivers/watchdog/wdat_wdt.c
+++ b/drivers/watchdog/wdat_wdt.c
@@ -351,16 +351,17 @@ static int wdat_wdt_probe(struct platform_device *pdev)
                 res = &pdev->resource[i];
                 if (resource_type(res) == IORESOURCE_MEM) {
                         reg = devm_ioremap_resource(&pdev->dev, res);
+                        if (IS_ERR(reg))
+                                return PTR_ERR(reg);
                 } else if (resource_type(res) == IORESOURCE_IO) {
                         reg = devm_ioport_map(&pdev->dev, res->start, 1);
+                        if (!reg)
+                                return -ENOMEM;
                 } else {
                         dev_err(&pdev->dev, "Unsupported resource\n");
                         return -EINVAL;
                 }
 
-                if (!reg)
-                        return -ENOMEM;
-
                 regs[i] = reg;
         }