dmaengine: axi-dmac: Propagate errors from platform_get_irq()

Propagate errors returned by platform_get_irq() to the driver core. This
will enable proper probe deferring for the driver in case the IRQ provider
has not been registered yet.

Signed-off-by: Lars-Peter Clausen <[e-mail]>
Signed-off-by: Vinod Koul <[e-mail]>

drivers/dma/dma-axi-dmac.c

···
 		return -ENOMEM;
 
 	dmac->irq = platform_get_irq(pdev, 0);
-	if (dmac->irq <= 0)
+	if (dmac->irq < 0)
+		return dmac->irq;
+	if (dmac->irq == 0)
 		return -EINVAL;
 
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);