crypto: exynos - use devm_platform_ioremap_resource() to simplify code

Use devm_platform_ioremap_resource() to simplify the code a bit.
This is detected by coccinelle.

Reported-by: Hulk Robot <[e-mail]>
Signed-off-by: YueHaibing <[e-mail]>
Reviewed-by: Krzysztof Kozlowski <[e-mail]>
Signed-off-by: Herbert Xu <[e-mail]>

drivers/crypto/exynos-rng.c

···
 static int exynos_rng_probe(struct platform_device *pdev)
 {
 	struct exynos_rng_dev *rng;
-	struct resource *res;
 	int ret;
 
 	if (exynos_rng_dev)
···
 		return PTR_ERR(rng->clk);
 	}
 
-	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	rng->mem = devm_ioremap_resource(&pdev->dev, res);
+	rng->mem = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(rng->mem))
 		return PTR_ERR(rng->mem);