[IPSEC]: Move RO-specific output code into xfrm6_mode_ro.c

The lastused update check in xfrm_output can be done just as well in
the mode output function which is specific to RO.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv6/xfrm6_mode_ro.c b/net/ipv6/xfrm6_mode_ro.c
index 6ad6d7a..a156373 100644
--- a/net/ipv6/xfrm6_mode_ro.c
+++ b/net/ipv6/xfrm6_mode_ro.c
@@ -29,6 +29,7 @@
 #include <linux/module.h>
 #include <linux/skbuff.h>
 #include <linux/stringify.h>
+#include <linux/time.h>
 #include <net/ipv6.h>
 #include <net/xfrm.h>
 
@@ -57,6 +58,9 @@
 			       (prevhdr - x->props.header_len) - skb->data);
 	skb_set_transport_header(skb, hdr_len);
 	memmove(skb->data, iph, hdr_len);
+
+	x->lastused = get_seconds();
+
 	return 0;
 }