net: constify net_class

AFAICS all users of net_class take a const struct class * argument.
Therefore fully constify net_class.
Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Acked-by: Stephen Hemminger <stephen@networkplumber.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/core/net-sysfs.c

@@ -2046,7 +2046,7 @@ static void net_get_ownership(const struct device *d, kuid_t *uid, kgid_t *gid)
 	net_ns_get_ownership(net, uid, gid);
 }
 
-static struct class net_class __ro_after_init = {
+static const struct class net_class = {
 	.name = "net",
 	.dev_release = netdev_release,
 	.dev_groups = net_class_groups,