drivers/ata/sata_rcar.c: simplify use of devm_ioremap_resource

Author: Julia Lawall <Julia.Lawall@lip6.fr>

Remove unneeded error handling on the result of a call to
platform_get_resource when the value is passed to devm_ioremap_resource.

Move the call to platform_get_resource adjacent to the call to
devm_ioremap_resource to make the connection between them more clear.

A simplified version of the semantic patch that makes this change is as
follows: (http://coccinelle.lip6.fr/)

// 
@@
expression pdev,res,n,e,e1;
expression ret != 0;
identifier l;
@@

- res = platform_get_resource(pdev, IORESOURCE_MEM, n);
  ... when != res
- if (res == NULL) { ... \(goto l;\|return ret;\) }
  ... when != res
+ res = platform_get_resource(pdev, IORESOURCE_MEM, n);
  e = devm_ioremap_resource(e1, res);
// 

Signed-off-by: Julia Lawall 
Signed-off-by: Tejun Heo 

---
 drivers/ata/sata_rcar.c | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)
 
diff --git a/drivers/ata/sata_rcar.c b/drivers/ata/sata_rcar.c
index 8108eb0..c2d95e9 100644
--- a/drivers/ata/sata_rcar.c
+++ b/drivers/ata/sata_rcar.c
@@ -778,10 +778,6 @@ static int sata_rcar_probe(struct platform_device *pdev)
 	int irq;
 	int ret = 0;
 
-	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	if (mem == NULL)
-		return -EINVAL;
-
 	irq = platform_get_irq(pdev, 0);
 	if (irq <= 0)
 		return -EINVAL;
@@ -807,6 +803,7 @@ static int sata_rcar_probe(struct platform_device *pdev)
 
 	host->private_data = priv;
 
+	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	priv->base = devm_ioremap_resource(&pdev->dev, mem);
 	if (IS_ERR(priv->base)) {
 		ret = PTR_ERR(priv->base);