wifi: rtl8xxxu: 8188e: convert usage of priv->vif to priv->vifs[0]

The driver currently does not support AP or concurrent mode for 8188e,
so just use priv->vifs[0] instead of priv->vif for now.
Signed-off-by: Martin Kaistra <martin.kaistra@linutronix.de>
Reviewed-by: Ping-Ke Shih <pkshih@realtek.com>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://msgid.link/20231222101442.626837-5-martin.kaistra@linutronix.de

drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_8188e.c

@@ -1699,7 +1699,7 @@ void rtl8188e_handle_ra_tx_report2(struct rtl8xxxu_priv *priv, struct sk_buff *s
 	/* We only use macid 0, so only the first item is relevant.
 	 * AP mode will use more of them if it's ever implemented.
 	 */
-	if (!priv->vif || priv->vif->type == NL80211_IFTYPE_STATION)
+	if (!priv->vifs[0] || priv->vifs[0]->type == NL80211_IFTYPE_STATION)
 		items = 1;
 
 	for (macid = 0; macid < items; macid++) {