hwrng: tx4939 - use devm_request_and_ioremap

Reimplement a call to devm_request_mem_region followed by a call to ioremap
or ioremap_nocache by a call to devm_request_and_ioremap.

The semantic patch that makes this transformation is as follows:
(http://coccinelle.lip6.fr/)

// <smpl>
@nm@
expression myname;
identifier i;
@@

struct platform_driver i = { .driver = { .name = myname } };

@@
expression dev,res,size;
expression nm.myname;
@@

-if (!devm_request_mem_region(dev, res->start, size,
-                              \(res->name\|dev_name(dev)\|myname\))) {
-   ...
-   return ...;
-}
... when != res->start
(
-devm_ioremap(dev,res->start,size)
+devm_request_and_ioremap(dev,res)
|
-devm_ioremap_nocache(dev,res->start,size)
+devm_request_and_ioremap(dev,res)
)
... when any
    when != res->start
// </smpl>

Signed-off-by: Julia Lawall <julia@diku.dk>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

drivers/char/hw_random/tx4939-rng.c

@@ -115,10 +115,7 @@ static int __init tx4939_rng_probe(struct platform_device *dev)
 	rngdev = devm_kzalloc(&dev->dev, sizeof(*rngdev), GFP_KERNEL);
 	if (!rngdev)
 		return -ENOMEM;
-	if (!devm_request_mem_region(&dev->dev, r->start, resource_size(r),
-				     dev_name(&dev->dev)))
-		return -EBUSY;
-	rngdev->base = devm_ioremap(&dev->dev, r->start, resource_size(r));
+	rngdev->base = devm_request_and_ioremap(&dev->dev, r);
 	if (!rngdev->base)
 		return -EBUSY;