Thermal: spear_thermal: convert to devm_ioremap_resource

Use the newly introduced devm_ioremap_resource().

devm_ioremap_resource() provides its own error messages; so all explicit
error messages can be removed from the failure code paths.

CC: Vincenzo Frascino <vincenzo.frascino@st.com>
Signed-off-by: Zhang Rui <rui.zhang@intel.com>

drivers/thermal/spear_thermal.c

@@ -104,7 +104,7 @@ static int spear_thermal_probe(struct platform_device *pdev)
 	struct thermal_zone_device *spear_thermal = NULL;
 	struct spear_thermal_dev *stdev;
 	struct device_node *np = pdev->dev.of_node;
-	struct resource *stres = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	struct resource *res;
 	int ret = 0, val;
 
 	if (!np || !of_property_read_u32(np, "st,thermal-flags", &val)) {
@@ -112,23 +112,23 @@ static int spear_thermal_probe(struct platform_device *pdev)
 		return -EINVAL;
 	}
 
-	if (!stres) {
-		dev_err(&pdev->dev, "memory resource missing\n");
-		return -ENODEV;
-	}
-
 	stdev = devm_kzalloc(&pdev->dev, sizeof(*stdev), GFP_KERNEL);
 	if (!stdev) {
 		dev_err(&pdev->dev, "kzalloc fail\n");
 		return -ENOMEM;
 	}
 
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!res) {
+		dev_err(&pdev->dev, "memory resource missing\n");
+		return -ENODEV;
+	}
+
 	/* Enable thermal sensor */
-	stdev->thermal_base = devm_ioremap(&pdev->dev, stres->start,
-			resource_size(stres));
-	if (!stdev->thermal_base) {
+	stdev->thermal_base = devm_ioremap_resource(dev, res);
+	if (IS_ERR(stdev->thermal_base)) {
 		dev_err(&pdev->dev, "ioremap failed\n");
-		return -ENOMEM;
+		return PTR_ERR(stdev->thermal_base);
 	}
 
 	stdev->clk = devm_clk_get(&pdev->dev, NULL);