ACPI: scan: Use standard error checking pattern

Check for an error and return it as it's the usual way to handle this.

Signed-off-by: Andy Shevchenko <[e-mail]>
Signed-off-by: Rafael J. Wysocki <[e-mail]>

drivers/acpi/scan.c

···
 			   struct fwnode_handle *fwnode,
 			   const struct iommu_ops *ops)
 {
-	int ret = iommu_fwspec_init(dev, fwnode, ops);
+	int ret;
 
-	if (!ret)
-		ret = iommu_fwspec_add_ids(dev, &id, 1);
+	ret = iommu_fwspec_init(dev, fwnode, ops);
+	if (ret)
+		return ret;
 
-	return ret;
+	return iommu_fwspec_add_ids(dev, &id, 1);
 }
 
 static inline const struct iommu_ops *acpi_iommu_fwspec_ops(struct device *dev)