net/b43: don't return IRQ_HANDLED if nothing was done

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/b43/main.c

@@ -1964,7 +1964,7 @@ static irqreturn_t b43_do_interrupt(struct b43_wldev *dev)
 		return IRQ_NONE;
 	reason &= dev->irq_mask;
 	if (!reason)
-		return IRQ_HANDLED;
+		return IRQ_NONE;
 
 	dev->dma_reason[0] = b43_read32(dev, B43_MMIO_DMA0_REASON)
 	    & 0x0001DC00;