backlight: convert platform_lcd to devm_kzalloc()

Saves some error handling code and eliminates a class of leaks.
Signed-off-by: NMark Brown <broonie@opensource.wolfsonmicro.com>
Cc: Richard Purdie <rpurdie@rpsys.net>
Cc: Florian Tobias Schandinat <FlorianSchandinat@gmx.de>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

drivers/video/backlight/platform_lcd.c

@@ -85,7 +85,8 @@ static int __devinit platform_lcd_probe(struct platform_device *pdev)
 		return -EINVAL;
 	}
 
-	plcd = kzalloc(sizeof(struct platform_lcd), GFP_KERNEL);
+	plcd = devm_kzalloc(&pdev->dev, sizeof(struct platform_lcd),
+			    GFP_KERNEL);
 	if (!plcd) {
 		dev_err(dev, "no memory for state\n");
 		return -ENOMEM;
@@ -98,7 +99,7 @@ static int __devinit platform_lcd_probe(struct platform_device *pdev)
 	if (IS_ERR(plcd->lcd)) {
 		dev_err(dev, "cannot register lcd device\n");
 		err = PTR_ERR(plcd->lcd);
-		goto err_mem;
+		goto err;
 	}
 
 	platform_set_drvdata(pdev, plcd);
@@ -106,8 +107,7 @@ static int __devinit platform_lcd_probe(struct platform_device *pdev)
 
 	return 0;
 
- err_mem:
-	kfree(plcd);
+ err:
 	return err;
 }
 
@@ -116,7 +116,6 @@ static int __devexit platform_lcd_remove(struct platform_device *pdev)
 	struct platform_lcd *plcd = platform_get_drvdata(pdev);
 
 	lcd_device_unregister(plcd->lcd);
-	kfree(plcd);
 
 	return 0;
 }