ath10k: Initialize list-head on vif creation.

If the creation fails, this keeps us from crashing later when
trying to do a list_del(arvif->list).
Signed-off-by: Ben Greear <greearb@candelatech.com>
Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>

drivers/net/wireless/ath/ath10k/mac.c

@@ -2064,6 +2064,7 @@ static int ath10k_add_interface(struct ieee80211_hw *hw,
 	arvif->vif = vif;
 
 	INIT_WORK(&arvif->wep_key_work, ath10k_tx_wep_key_work);
+	INIT_LIST_HEAD(&arvif->list);
 
 	if ((vif->type == NL80211_IFTYPE_MONITOR) && ar->monitor_present) {
 		ath10k_warn("Only one monitor interface allowed\n");