mt76: mt7663s: fix a possible ple quota underflow

Properly account current consumed ple quota in mt7663s_tx_pick_quota
routine and avoid possible underflow.

Fixes: 6ef2d665 ("mt76: mt7663s: split mt7663s_tx_update_sched in mt7663s_tx_{pick,update}_quota")
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Signed-off-by: Felix Fietkau <nbd@nbd.name>

drivers/net/wireless/mediatek/mt76/mt7615/sdio_txrx.c

@@ -180,7 +180,7 @@ static int mt7663s_tx_pick_quota(struct mt76_sdio *sdio, enum mt76_txq_id qid,
 			return -EBUSY;
 	} else {
 		if (sdio->sched.pse_data_quota < *pse_size + pse_sz ||
-		    sdio->sched.ple_data_quota < *ple_size)
+		    sdio->sched.ple_data_quota < *ple_size + 1)
 			return -EBUSY;
 
 		*ple_size = *ple_size + 1;