watchdog: armada_37xx_wdt: check the return value of devm_ioremap() in armada_37xx_wdt_probe()

The function devm_ioremap() in armada_37xx_wdt_probe() can fail, so
its return value should be checked.

Fixes: 54e3d9b ("watchdog: Add support for Armada 37xx CPU watchdog")
Reported-by: Hacash Robot <[email protected]>
Signed-off-by: William Dean <[email protected]>
Reviewed-by: Marek Beh=C3=BAn <[email protected]>
Reviewed-by: Guenter Roeck <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Guenter Roeck <[email protected]>
Signed-off-by: Wim Van Sebroeck <[email protected]>

Author: William Dean

drivers/watchdog/armada_37xx_wdt.c

@@ -274,6 +274,8 @@ static int armada_37xx_wdt_probe(struct platform_device *pdev)
 	if (!res)
 		return -ENODEV;
 	dev->reg = devm_ioremap(&pdev->dev, res->start, resource_size(res));
+	if (!dev->reg)
+		return -ENOMEM;
 
 	/* init clock */
 	dev->clk = devm_clk_get(&pdev->dev, NULL);