mt76: mt7615: do not do any work in napi poll after calling napi_complete_done()

Fixes a race condition where multiple tx cleanup tasks could run in parallel
Signed-off-by: NFelix Fietkau <nbd@nbd.name>

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

@@ -117,14 +117,12 @@ static int mt7615_poll_tx(struct napi_struct *napi, int budget)
 
 	mt7615_tx_cleanup(dev);
 
-	if (napi_complete_done(napi, 0))
-		mt7615_irq_enable(dev, MT_INT_TX_DONE_ALL);
-
-	mt7615_tx_cleanup(dev);
-
 	mt7615_pm_power_save_sched(dev);
 	tasklet_schedule(&dev->mt76.tx_tasklet);
 
+	if (napi_complete_done(napi, 0))
+		mt7615_irq_enable(dev, MT_INT_TX_DONE_ALL);
+
 	return 0;
 }