dmaengine: ti-dma-crossbar: Fix checking return value of devm_ioremap_resource

devm_ioremap_resource returns ERR_PTR on failure.
Signed-off-by: Axel Lin <axel.lin@ingics.com>
Acked-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>

drivers/dma/ti-dma-crossbar.c

@@ -162,12 +162,9 @@ static int ti_dma_xbar_probe(struct platform_device *pdev)
 		xbar->safe_val = (u16)safe_val;
 
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	if (!res)
-		return -ENODEV;
-
 	iomem = devm_ioremap_resource(&pdev->dev, res);
-	if (!iomem)
-		return -ENOMEM;
+	if (IS_ERR(iomem))
+		return PTR_ERR(iomem);
 
 	xbar->iomem = iomem;