xfrm: Extend the sec_path for IPsec offloading

We need to keep per packet offloading informations across
the layers. So we extend the sec_path to carry these for
the input and output offload codepath.

Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
diff --git a/net/xfrm/xfrm_input.c b/net/xfrm/xfrm_input.c
index 86f8a8d..d2ff712 100644
--- a/net/xfrm/xfrm_input.c
+++ b/net/xfrm/xfrm_input.c
@@ -105,6 +105,8 @@
 		return NULL;
 
 	sp->len = 0;
+	sp->olen = 0;
+
 	if (src) {
 		int i;