[IPVS]: Replace local version of skb_make_writable

This patch removes the IPVS-specific version of skb_make_writable and
replaces it with the netfilter one.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv4/ipvs/ip_vs_app.c b/net/ipv4/ipvs/ip_vs_app.c
index 341474e..8ca5f48 100644
--- a/net/ipv4/ipvs/ip_vs_app.c
+++ b/net/ipv4/ipvs/ip_vs_app.c
@@ -25,6 +25,7 @@
 #include <linux/skbuff.h>
 #include <linux/in.h>
 #include <linux/ip.h>
+#include <linux/netfilter.h>
 #include <net/net_namespace.h>
 #include <net/protocol.h>
 #include <net/tcp.h>
@@ -336,7 +337,7 @@
 	struct tcphdr *th;
 	__u32 seq;
 
-	if (!ip_vs_make_skb_writable(pskb, tcp_offset + sizeof(*th)))
+	if (!skb_make_writable(*pskb, tcp_offset + sizeof(*th)))
 		return 0;
 
 	th = (struct tcphdr *)(skb_network_header(*pskb) + tcp_offset);
@@ -411,7 +412,7 @@
 	struct tcphdr *th;
 	__u32 seq;
 
-	if (!ip_vs_make_skb_writable(pskb, tcp_offset + sizeof(*th)))
+	if (!skb_make_writable(*pskb, tcp_offset + sizeof(*th)))
 		return 0;
 
 	th = (struct tcphdr *)(skb_network_header(*pskb) + tcp_offset);