mt76: fix timestamp check in tx_status

Should keep SKBs only if timeout timestamp is still after jiffies.
Otherwise, report tx status and drop it direclty.

Fixes: bd1e3e7b ("mt76: introduce packet_id idr")
Signed-off-by: Deren Wu <deren.wu@mediatek.com>
Acked-by: Felix Fietkau <nbd@nbd.name>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/7e3784949c0b29a00465966b89fdb0192bd0298e.1637593492.git.deren.wu@mediatek.com

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

@@ -173,7 +173,7 @@ mt76_tx_status_skb_get(struct mt76_dev *dev, struct mt76_wcid *wcid, int pktid,
 			if (!(cb->flags & MT_TX_CB_DMA_DONE))
 				continue;
 
-			if (!time_is_after_jiffies(cb->jiffies +
+			if (time_is_after_jiffies(cb->jiffies +
 						   MT_TX_STATUS_SKB_TIMEOUT))
 				continue;
 		}