mac80211: check sdata_running on set_bitrate_mask

Otherwise, we will call the driver callback although
the sdata wasn't uploaded yet.

Signed-off-by: Eliad Peller <eliad@wizery.com>

net/mac80211/cfg.c

@@ -1912,6 +1912,9 @@ static int ieee80211_set_bitrate_mask(struct wiphy *wiphy,
 	struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 	int i, ret;
 
+	if (!ieee80211_sdata_running(sdata))
+		return -ENETDOWN;
+
 	if (local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL) {
 		ret = drv_set_bitrate_mask(local, sdata, mask);
 		if (ret)