inet: Replace left-over references to inet->cork

The patch to replace inet->cork with cork left out two spots in
__ip_append_data that can result in bogus packet construction.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/ipv4/ip_output.c

@@ -789,7 +789,7 @@ static int __ip_append_data(struct sock *sk, struct sk_buff_head *queue,
 	struct inet_sock *inet = inet_sk(sk);
 	struct sk_buff *skb;
 
-	struct ip_options *opt = inet->cork.opt;
+	struct ip_options *opt = cork->opt;
 	int hh_len;
 	int exthdrlen;
 	int mtu;
@@ -803,7 +803,7 @@ static int __ip_append_data(struct sock *sk, struct sk_buff_head *queue,
 	exthdrlen = transhdrlen ? rt->dst.header_len : 0;
 	length += exthdrlen;
 	transhdrlen += exthdrlen;
-	mtu = inet->cork.fragsize;
+	mtu = cork->fragsize;
 
 	hh_len = LL_RESERVED_SPACE(rt->dst.dev);