dmaengine: imx-sdma: Return a proper error code in platform_get_irq()

There is no need to return a 'fake' value upon platform_get_irq() failure.

Just propagate the real error instead.
Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>

drivers/dma/imx-sdma.c

@@ -1483,7 +1483,7 @@ static int sdma_probe(struct platform_device *pdev)
 
 	irq = platform_get_irq(pdev, 0);
 	if (irq < 0)
-		return -EINVAL;
+		return irq;
 
 	iores = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	sdma->regs = devm_ioremap_resource(&pdev->dev, iores);