net: Remove unnecessary variables

It is not necessary to define variables to receive -ENOMEM,
directly return -ENOMEM.
Signed-off-by: zuoqilin <zuoqilin@yulong.com>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>

net/key/af_key.c

@@ -141,7 +141,6 @@ static int pfkey_create(struct net *net, struct socket *sock, int protocol,
 	struct netns_pfkey *net_pfkey = net_generic(net, pfkey_net_id);
 	struct sock *sk;
 	struct pfkey_sock *pfk;
-	int err;
 
 	if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
 		return -EPERM;
@@ -150,10 +149,9 @@ static int pfkey_create(struct net *net, struct socket *sock, int protocol,
 	if (protocol != PF_KEY_V2)
 		return -EPROTONOSUPPORT;
 
-	err = -ENOMEM;
 	sk = sk_alloc(net, PF_KEY, GFP_KERNEL, &key_proto, kern);
 	if (sk == NULL)
-		goto out;
+		return -ENOMEM;
 
 	pfk = pfkey_sk(sk);
 	mutex_init(&pfk->dump_lock);
@@ -169,8 +167,6 @@ static int pfkey_create(struct net *net, struct socket *sock, int protocol,
 	pfkey_insert(sk);
 
 	return 0;
-out:
-	return err;
 }
 
 static int pfkey_release(struct socket *sock)