Revert "net: Reset secmark when scrubbing packet"

This patch reverts commit b8fb4e06
because the secmark must be preserved even when a packet crosses
namespace boundaries.  The reason is that security labels apply to
the system as a whole and is not per-namespace.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/core/skbuff.c

@@ -4133,7 +4133,6 @@ void skb_scrub_packet(struct sk_buff *skb, bool xnet)
 	skb_dst_drop(skb);
 	skb->mark = 0;
 	skb_sender_cpu_clear(skb);
-	skb_init_secmark(skb);
 	secpath_reset(skb);
 	nf_reset(skb);
 	nf_reset_trace(skb);