iio:light:jsa1212: Switch from CONFIG_PM_SLEEP guards to pm_sleep_ptr() etc

Letting the compiler remove these functions when the kernel is built
without CONFIG_PM_SLEEP support is simpler and less error prone than the
use of #ifdef based config guards.

Removing instances of this approach from IIO also stops them being
copied into new drivers.
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by: Paul Cercueil <paul@crapouillou.net>
Link: https://lore.kernel.org/r/20220130193147.279148-23-jic23@kernel.org

drivers/iio/light/jsa1212.c

@@ -383,7 +383,6 @@ static int jsa1212_remove(struct i2c_client *client)
 	return jsa1212_power_off(data);
 }
 
-#ifdef CONFIG_PM_SLEEP
 static int jsa1212_suspend(struct device *dev)
 {
 	struct jsa1212_data *data;
@@ -421,12 +420,8 @@ static int jsa1212_resume(struct device *dev)
 	return ret;
 }
 
-static SIMPLE_DEV_PM_OPS(jsa1212_pm_ops, jsa1212_suspend, jsa1212_resume);
-
-#define JSA1212_PM_OPS (&jsa1212_pm_ops)
-#else
-#define JSA1212_PM_OPS NULL
-#endif
+static DEFINE_SIMPLE_DEV_PM_OPS(jsa1212_pm_ops, jsa1212_suspend,
+				jsa1212_resume);
 
 static const struct acpi_device_id jsa1212_acpi_match[] = {
 	{"JSA1212", 0},
@@ -443,7 +438,7 @@ MODULE_DEVICE_TABLE(i2c, jsa1212_id);
 static struct i2c_driver jsa1212_driver = {
 	.driver = {
 		.name	= JSA1212_DRIVER_NAME,
-		.pm	= JSA1212_PM_OPS,
+		.pm	= pm_sleep_ptr(&jsa1212_pm_ops),
 		.acpi_match_table = ACPI_PTR(jsa1212_acpi_match),
 	},
 	.probe		= jsa1212_probe,