drivers/perf: arm-ccn: Use devm_ioremap_resource() to map memory

Instead of checking the return value of platform_get_resource(), we can
use devm_ioremap_resource() which has the NULL pointer check and the
memory region requesting. devm_ioremap_resource is designed to replace
calls to devm_request_mem_region followed by devm_ioremap, so let's use
the same.

Cc: Will Deacon <will.deacon@arm.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>

drivers/perf/arm-ccn.c

@@ -1485,17 +1485,9 @@ static int arm_ccn_probe(struct platform_device *pdev)
 	platform_set_drvdata(pdev, ccn);
 
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	if (!res)
-		return -EINVAL;
-
-	if (!devm_request_mem_region(ccn->dev, res->start,
-			resource_size(res), pdev->name))
-		return -EBUSY;
-
-	ccn->base = devm_ioremap(ccn->dev, res->start,
-				resource_size(res));
-	if (!ccn->base)
-		return -EFAULT;
+	ccn->base = devm_ioremap_resource(ccn->dev, res);
+	if (IS_ERR(ccn->base))
+		return PTR_ERR(ccn->base);
 
 	res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
 	if (!res)