net: reduce structures when XFRM=n

ifdef out
* struct sk_buff::sp		(pointer)
* struct dst_entry::xfrm	(pointer)
* struct sock::sk_policy	(2 pointers)

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index 4e22e3a..cdfe473 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -489,7 +489,7 @@
 	new->network_header	= old->network_header;
 	new->mac_header		= old->mac_header;
 	new->dst		= dst_clone(old->dst);
-#ifdef CONFIG_INET
+#ifdef CONFIG_XFRM
 	new->sp			= secpath_get(old->sp);
 #endif
 	memcpy(new->cb, old->cb, sizeof(old->cb));