mt76: avoid enabling interrupt if NAPI poll is still pending

if napi_complete() returns false, it means that polling is still pending.
Interrupts should not fire until the polling is no longer scheduled
Signed-off-by: NFelix Fietkau <nbd@nbd.name>

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

@@ -539,10 +539,8 @@ mt76_dma_rx_poll(struct napi_struct *napi, int budget)
 
 	rcu_read_unlock();
 
-	if (done < budget) {
-		napi_complete(napi);
+	if (done < budget && napi_complete(napi))
 		dev->drv->rx_poll_complete(dev, qid);
-	}
 
 	return done;
 }