hwmon: convert drivers/hwmon/* to use module_platform_driver()

This patch converts the drivers in drivers/hwmon/* to use the
module_platform_driver() macro which makes the code smaller and a bit
simpler.

Cc: Donggeun Kim <[email protected]>
Cc: Simon Guinot <[email protected]>
Cc: Lars-Peter Clausen <[email protected]>
Cc: MyungJoo Ham <[email protected]>
Cc: Ben Dooks <[email protected]>
Cc: Hans de Goede <[email protected]>
Cc: J Keerthy <[email protected]>
Cc: David S. Miller <[email protected]>
Cc: Mark Brown <[email protected]>
Signed-off-by: Axel Lin <[email protected]>
Acked-by: Mark Brown <[email protected]>
Signed-off-by: Guenter Roeck <[email protected]>
diff --git a/drivers/hwmon/gpio-fan.c b/drivers/hwmon/gpio-fan.c
index 89aa9fb..9ba38f3 100644
--- a/drivers/hwmon/gpio-fan.c
+++ b/drivers/hwmon/gpio-fan.c
@@ -539,18 +539,7 @@
 	},
 };
 
-static int __init gpio_fan_init(void)
-{
-	return platform_driver_register(&gpio_fan_driver);
-}
-
-static void __exit gpio_fan_exit(void)
-{
-	platform_driver_unregister(&gpio_fan_driver);
-}
-
-module_init(gpio_fan_init);
-module_exit(gpio_fan_exit);
+module_platform_driver(gpio_fan_driver);
 
 MODULE_AUTHOR("Simon Guinot <[email protected]>");
 MODULE_DESCRIPTION("GPIO FAN driver");