net: use the new API kvfree()

It is available since v3.15-rc5.

Cc: Pablo Neira Ayuso <pablo@netfilter.org>
Cc: "David S. Miller" <davem@davemloft.net>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/sched/sch_choke.c b/net/sched/sch_choke.c
index 2aee028..ed30e43 100644
--- a/net/sched/sch_choke.c
+++ b/net/sched/sch_choke.c
@@ -391,12 +391,7 @@
 
 static void choke_free(void *addr)
 {
-	if (addr) {
-		if (is_vmalloc_addr(addr))
-			vfree(addr);
-		else
-			kfree(addr);
-	}
+	kvfree(addr);
 }
 
 static int choke_change(struct Qdisc *sch, struct nlattr *opt)