net_sched: get rid of struct tcf_common

After the previous patch, struct tc_action should be enough
to represent the generic tc action, tcf_common is not necessary
any more. This patch gets rid of it to make tc action code
more readable.

Cc: Jamal Hadi Salim <jhs@mojatatu.com>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/net/tc_act/tc_bpf.h b/include/net/tc_act/tc_bpf.h
index 80a4d6f..2b94673 100644
--- a/include/net/tc_act/tc_bpf.h
+++ b/include/net/tc_act/tc_bpf.h
@@ -14,7 +14,7 @@
 #include <net/act_api.h>
 
 struct tcf_bpf {
-	struct tcf_common	common;
+	struct tc_action	common;
 	struct bpf_prog __rcu	*filter;
 	union {
 		u32		bpf_fd;