hwrng: tx4939 – 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: Herbert Xu 

---
 drivers/char/hw_random/tx4939-rng.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)
 
diff --git a/drivers/char/hw_random/tx4939-rng.c b/drivers/char/hw_random/tx4939-rng.c
index 00593c8..09c5fbe 100644
--- a/drivers/char/hw_random/tx4939-rng.c
+++ b/drivers/char/hw_random/tx4939-rng.c
@@ -110,12 +110,10 @@ static int __init tx4939_rng_probe(struct platform_device *dev)
 	struct resource *r;
 	int i;
 
-	r = platform_get_resource(dev, IORESOURCE_MEM, 0);
-	if (!r)
-		return -EBUSY;
 	rngdev = devm_kzalloc(&dev->dev, sizeof(*rngdev), GFP_KERNEL);
 	if (!rngdev)
 		return -ENOMEM;
+	r = platform_get_resource(dev, IORESOURCE_MEM, 0);
 	rngdev->base = devm_ioremap_resource(&dev->dev, r);
 	if (IS_ERR(rngdev->base))
 		return PTR_ERR(rngdev->base);