mac80211: add ieee80211_sdata_running

Instead of always using netif_running(sdata->dev)
use ieee80211_sdata_running(sdata) now which is
just an inline containing netif_running() for now.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/net/mac80211/mesh.c b/net/mac80211/mesh.c
index e0bd85e..61080c5 100644
--- a/net/mac80211/mesh.c
+++ b/net/mac80211/mesh.c
@@ -645,7 +645,7 @@
 	struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 	struct sk_buff *skb;
 
-	if (!netif_running(sdata->dev))
+	if (!ieee80211_sdata_running(sdata))
 		return;
 
 	if (local->scanning)