hwmon: (core) Make hwmon_class const

Now that the driver core allows for struct class to be in read-only
memory, mark hwmon_class as const.

Signed-off-by: Thomas Weißschuh <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Guenter Roeck <[e-mail]>

drivers/hwmon/hwmon.c

···
 	kfree(hwdev);
 }
 
-static struct class hwmon_class = {
+static const struct class hwmon_class = {
 	.name = "hwmon",
 	.dev_groups = hwmon_dev_attr_groups,
 	.dev_release = hwmon_dev_release,