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>
diff --git a/net/ipv4/ip_output.c b/net/ipv4/ip_output.c
index 68dbe2d..33316b35 100644
--- a/net/ipv4/ip_output.c
+++ b/net/ipv4/ip_output.c
@@ -789,7 +789,7 @@
 	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 @@
 	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);