net: remove redundant ifdef CONFIG_CGROUPS

The cgroup code has been surrounded by ifdef CONFIG_NET_CLS_CGROUP
and CONFIG_NETPRIO_CGROUP.
Signed-off-by: Li Zefan <lizefan@huawei.com>
Acked-by: Neil Horman <nhorman@tuxdriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/core/sock.c

@@ -1298,7 +1298,6 @@ static void sk_prot_free(struct proto *prot, struct sock *sk)
 	module_put(owner);
 }
 
-#ifdef CONFIG_CGROUPS
 #if IS_ENABLED(CONFIG_NET_CLS_CGROUP)
 void sock_update_classid(struct sock *sk, struct task_struct *task)
 {
@@ -1321,7 +1320,6 @@ void sock_update_netprioidx(struct sock *sk, struct task_struct *task)
 }
 EXPORT_SYMBOL_GPL(sock_update_netprioidx);
 #endif
-#endif
 
 /**
  *	sk_alloc - All socket objects are allocated here