batman-adv: refactor wifi interface detection

The ELP protocol requires cfg80211 to auto-detect the WiFi througput
to a given neighbor. Use batadv_is_cfg80211_netdev() to determine
whether or not an interface is eligible.

Signed-off-by: Marek Lindner <mareklindner@neomailbox.ch>
Signed-off-by: Sven Eckelmann <sven.eckelmann@open-mesh.com>
Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
diff --git a/net/batman-adv/bat_v_elp.c b/net/batman-adv/bat_v_elp.c
index 54bdd41..e601def 100644
--- a/net/batman-adv/bat_v_elp.c
+++ b/net/batman-adv/bat_v_elp.c
@@ -90,22 +90,21 @@ static u32 batadv_v_elp_get_throughput(struct batadv_hardif_neigh_node *neigh)
 	 * cfg80211 API
 	 */
 	if (batadv_is_wifi_netdev(hard_iface->net_dev)) {
-		if (hard_iface->net_dev->ieee80211_ptr) {
-			ret = cfg80211_get_station(hard_iface->net_dev,
-						   neigh->addr, &sinfo);
-			if (ret == -ENOENT) {
-				/* Node is not associated anymore! It would be
-				 * possible to delete this neighbor. For now set
-				 * the throughput metric to 0.
-				 */
-				return 0;
-			}
-			if (!ret)
-				return sinfo.expected_throughput / 100;
-		}
+		if (!batadv_is_cfg80211_netdev(hard_iface->net_dev))
+			/* unsupported WiFi driver version */
+			goto default_throughput;
 
-		/* unsupported WiFi driver version */
-		goto default_throughput;
+		ret = cfg80211_get_station(hard_iface->net_dev,
+					   neigh->addr, &sinfo);
+		if (ret == -ENOENT) {
+			/* Node is not associated anymore! It would be
+			 * possible to delete this neighbor. For now set
+			 * the throughput metric to 0.
+			 */
+			return 0;
+		}
+		if (!ret)
+			return sinfo.expected_throughput / 100;
 	}
 
 	/* if not a wifi interface, check if this device provides data via