mt76: do not check the ccmp pn for ONLY_MONITOR frame

if the received frame enables RX_FLAG_ONLY_MONITOR,
driver doesn't need to check the ccmp pn of this frame.
Reviewed-by: Ryder Lee <ryder.lee@mediatek.com>
Signed-off-by: MeiChia Chiu <MeiChia.Chiu@mediatek.com>
Signed-off-by: Felix Fietkau <nbd@nbd.name>

drivers/net/wireless/mediatek/mt76/mac80211.c

@@ -1030,6 +1030,9 @@ mt76_check_ccmp_pn(struct sk_buff *skb)
 	if (!(status->flag & RX_FLAG_DECRYPTED))
 		return 0;
 
+	if (status->flag & RX_FLAG_ONLY_MONITOR)
+		return 0;
+
 	if (!wcid || !wcid->rx_check_pn)
 		return 0;