hwmon: (nct6775) Switch to DEFINE_SIMPLE_DEV_PM_OPS() and pm_sleep_ptr()

These newer PM macros allow the compiler to see what code it can remove
if !CONFIG_PM_SLEEP. This allows the removal of __maybe_unused markings
whilst achieving the same result.
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Cc: Zoltán Kővágó <dirty.ice.hu@gmail.com>
Link: https://lore.kernel.org/r/20220925172759.3573439-13-jic23@kernel.orgSigned-off-by: Guenter Roeck <linux@roeck-us.net>

drivers/hwmon/nct6775-platform.c

@@ -355,7 +355,7 @@ static void nct6791_enable_io_mapping(struct nct6775_sio_data *sio_data)
 	}
 }
 
-static int __maybe_unused nct6775_suspend(struct device *dev)
+static int nct6775_suspend(struct device *dev)
 {
 	int err;
 	u16 tmp;
@@ -386,7 +386,7 @@ static int __maybe_unused nct6775_suspend(struct device *dev)
 	return err;
 }
 
-static int __maybe_unused nct6775_resume(struct device *dev)
+static int nct6775_resume(struct device *dev)
 {
 	struct nct6775_data *data = dev_get_drvdata(dev);
 	struct nct6775_sio_data *sio_data = dev_get_platdata(dev);
@@ -467,7 +467,7 @@ static int __maybe_unused nct6775_resume(struct device *dev)
 	return err;
 }
 
-static SIMPLE_DEV_PM_OPS(nct6775_dev_pm_ops, nct6775_suspend, nct6775_resume);
+static DEFINE_SIMPLE_DEV_PM_OPS(nct6775_dev_pm_ops, nct6775_suspend, nct6775_resume);
 
 static void
 nct6775_check_fan_inputs(struct nct6775_data *data, struct nct6775_sio_data *sio_data)
@@ -934,7 +934,7 @@ static int nct6775_platform_probe(struct platform_device *pdev)
 static struct platform_driver nct6775_driver = {
 	.driver = {
 		.name	= DRVNAME,
-		.pm	= &nct6775_dev_pm_ops,
+		.pm	= pm_sleep_ptr(&nct6775_dev_pm_ops),
 	},
 	.probe		= nct6775_platform_probe,
 };