thermal: qcom: tsens: Fix return value check in init_common()

In case of error, the function of_iomap() returns NULL pointer
not ERR_PTR(). The IS_ERR() test in the return value check
should be replaced with NULL test.
And the function devm_regmap_init_mmio() 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 <[e-mail]>
Acked-by: Rajendra Nayak <[e-mail]>
Signed-off-by: Zhang Rui <[e-mail]>

drivers/thermal/qcom/tsens-common.c

···
 	void __iomem *base;
 
 	base = of_iomap(tmdev->dev->of_node, 0);
-	if (IS_ERR(base))
+	if (!base)
 		return -EINVAL;
 
 	tmdev->map = devm_regmap_init_mmio(tmdev->dev, base, &tsens_config);
-	if (!tmdev->map) {
+	if (IS_ERR(tmdev->map)) {
 		iounmap(base);
-		return -ENODEV;
+		return PTR_ERR(tmdev->map);
 	}
 
 	return 0;