gpio: janzttl: use devm function

This uses dem function for mem allocation
Signed-off-by: Nabdoulaye berthe <berthe.ab@gmail.com>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>

drivers/gpio/gpio-janz-ttl.c

@@ -152,33 +152,21 @@ static int ttl_probe(struct platform_device *pdev)
 	pdata = dev_get_platdata(&pdev->dev);
 	if (!pdata) {
 		dev_err(dev, "no platform data\n");
-		ret = -ENXIO;
-		goto out_return;
+		return -ENXIO;
 	}
 
-	mod = kzalloc(sizeof(*mod), GFP_KERNEL);
-	if (!mod) {
-		ret = -ENOMEM;
-		goto out_return;
-	}
+	mod = devm_kzalloc(dev, sizeof(*mod), GFP_KERNEL);
+	if (!mod)
+		return -ENOMEM;
 
 	platform_set_drvdata(pdev, mod);
 	spin_lock_init(&mod->lock);
 
 	/* get access to the MODULbus registers for this module */
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	if (!res) {
-		dev_err(dev, "MODULbus registers not found\n");
-		ret = -ENODEV;
-		goto out_free_mod;
-	}
-
-	mod->regs = ioremap(res->start, resource_size(res));
-	if (!mod->regs) {
-		dev_err(dev, "MODULbus registers not ioremap\n");
-		ret = -ENOMEM;
-		goto out_free_mod;
-	}
+	mod->regs = devm_ioremap_resource(dev, res);
+	if (IS_ERR(mod->regs))
+		return PTR_ERR(mod->regs);
 
 	ttl_setup_device(mod);
 
@@ -197,17 +185,10 @@ static int ttl_probe(struct platform_device *pdev)
 	ret = gpiochip_add(gpio);
 	if (ret) {
 		dev_err(dev, "unable to add GPIO chip\n");
-		goto out_iounmap_regs;
+		return ret;
 	}
 
 	return 0;
-
-out_iounmap_regs:
-	iounmap(mod->regs);
-out_free_mod:
-	kfree(mod);
-out_return:
-	return ret;
 }
 
 static int ttl_remove(struct platform_device *pdev)
@@ -222,8 +203,6 @@ static int ttl_remove(struct platform_device *pdev)
 		return ret;
 	}
 
-	iounmap(mod->regs);
-	kfree(mod);
 	return 0;
 }