net: fix socket memcg build with !CONFIG_NET

There is still a build bug with the sock memcg code, that triggers
with !CONFIG_NET, that survived my series of randconfig builds.

Signed-off-by: Glauber Costa <glommer@parallels.com>
Reported-by: Randy Dunlap <rdunlap@xenotime.net>
CC: Hiroyouki Kamezawa <kamezawa.hiroyu@jp.fujitsu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 3dbff4d..c3688df 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -379,7 +379,7 @@
 static bool mem_cgroup_is_root(struct mem_cgroup *memcg);
 void sock_update_memcg(struct sock *sk)
 {
-	if (static_branch(&memcg_socket_limit_enabled)) {
+	if (mem_cgroup_sockets_enabled) {
 		struct mem_cgroup *memcg;
 
 		BUG_ON(!sk->sk_prot->proto_cgroup);
@@ -411,7 +411,7 @@
 
 void sock_release_memcg(struct sock *sk)
 {
-	if (static_branch(&memcg_socket_limit_enabled) && sk->sk_cgrp) {
+	if (mem_cgroup_sockets_enabled && sk->sk_cgrp) {
 		struct mem_cgroup *memcg;
 		WARN_ON(!sk->sk_cgrp->memcg);
 		memcg = sk->sk_cgrp->memcg;