qtnfmac: fix warnings when mBSS setup is stopped

Virtual interface should be deleted after calling unregister_netdevice
since this function ends up with sending updown_intf command to card.
Signed-off-by: Vasily Ulyanov <vulyanov@quantenna.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

drivers/net/wireless/quantenna/qtnfmac/cfg80211.c

@@ -120,10 +120,6 @@ int qtnf_del_virtual_intf(struct wiphy *wiphy, struct wireless_dev *wdev)
 
 	qtnf_scan_done(vif->mac, true);
 
-	if (qtnf_cmd_send_del_intf(vif))
-		pr_err("VIF%u.%u: failed to delete VIF\n", vif->mac->macid,
-		       vif->vifid);
-
 	/* Stop data */
 	netif_tx_stop_all_queues(netdev);
 	if (netif_carrier_ok(netdev))
@@ -132,6 +128,10 @@ int qtnf_del_virtual_intf(struct wiphy *wiphy, struct wireless_dev *wdev)
 	if (netdev->reg_state == NETREG_REGISTERED)
 		unregister_netdevice(netdev);
 
+	if (qtnf_cmd_send_del_intf(vif))
+		pr_err("VIF%u.%u: failed to delete VIF\n", vif->mac->macid,
+		       vif->vifid);
+
 	vif->netdev->ieee80211_ptr = NULL;
 	vif->netdev = NULL;
 	vif->wdev.iftype = NL80211_IFTYPE_UNSPECIFIED;