[PKT_SCHED]: Convert tc action functions to single skb pointers

tcf_action_exec only gets a single skb pointer and doesn't own the skb,
but passes double skb pointers (to a local variable) to the action
functions. Change to use single skb pointers everywhere.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/sched/police.c b/net/sched/police.c
index eb39fb2..a834516 100644
--- a/net/sched/police.c
+++ b/net/sched/police.c
@@ -284,11 +284,10 @@
 	return 0;
 }
 
-static int tcf_act_police(struct sk_buff **pskb, struct tc_action *a,
+static int tcf_act_police(struct sk_buff *skb, struct tc_action *a,
                           struct tcf_result *res)
 {
 	psched_time_t now;
-	struct sk_buff *skb = *pskb;
 	struct tcf_police *p = PRIV(a);
 	long toks;
 	long ptoks = 0;