net: Return the correct errno code

When kalloc or kmemdup failed, should return ENOMEM rather than ENOBUF.
Signed-off-by: NZheng Yongjun <zhengyongjun3@huawei.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

net/ipv4/af_inet.c

@@ -318,7 +318,7 @@ static int inet_create(struct net *net, struct socket *sock, int protocol,
 
 	WARN_ON(!answer_prot->slab);
 
-	err = -ENOBUFS;
+	err = -ENOMEM;
 	sk = sk_alloc(net, PF_INET, GFP_KERNEL, answer_prot, kern);
 	if (!sk)
 		goto out;