[NET_SCHED]: Use NLA_PUT_STRING for string dumping

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/sched/cls_fw.c b/net/sched/cls_fw.c
index e3dfbb3..3107473 100644
--- a/net/sched/cls_fw.c
+++ b/net/sched/cls_fw.c
@@ -352,7 +352,7 @@
 		NLA_PUT(skb, TCA_FW_CLASSID, 4, &f->res.classid);
 #ifdef CONFIG_NET_CLS_IND
 	if (strlen(f->indev))
-		NLA_PUT(skb, TCA_FW_INDEV, IFNAMSIZ, f->indev);
+		NLA_PUT_STRING(skb, TCA_FW_INDEV, f->indev);
 #endif /* CONFIG_NET_CLS_IND */
 	if (head->mask != 0xFFFFFFFF)
 		NLA_PUT(skb, TCA_FW_MASK, 4, &head->mask);