[Patch net] net_sched: fix a compiler warning for tcf_exts_for_each_action()

[Cong Wang]

When CONFIG_NET_CLS_ACT=n, tcf_exts_for_each_action()
is a nop, which leaves its parameters unused. Shut up
the compiler warning by casting them to void.

Fixes: 244cd96adb5f ("net_sched: remove list_head from tc_action")
Reported-by: Stephen Rothwell <s...@canb.auug.org.au>
Signed-off-by: Cong Wang <xiyou.wangc...@gmail.com>
---
 include/net/pkt_cls.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/net/pkt_cls.h b/include/net/pkt_cls.h
index c17d51865469..9ec471ffaa5d 100644
--- a/include/net/pkt_cls.h
+++ b/include/net/pkt_cls.h
@@ -303,7 +303,7 @@ static inline void tcf_exts_put_net(struct tcf_exts *exts)
        for (i = 0; i < TCA_ACT_MAX_PRIO && ((a) = (exts)->actions[i]); i++)
 #else
 #define tcf_exts_for_each_action(i, a, exts) \
-       for (; 0; )
+       for ((void)i, (void)a; 0; )
 #endif
 
 static inline void
-- 
2.14.4