backlight: atmel-pwm-bl: clean up probe error handling

Clean up probe error handling by checking parameters before any
allocations and removing an obsolete error label.  Also remove unnecessary
reset of private gpio number.
Signed-off-by: NJohan Hovold <jhovold@gmail.com>
Acked-by: NJingoo Han <jg1.han@samsung.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

drivers/video/backlight/atmel-pwm-bl.c

@@ -126,40 +126,33 @@ static int atmel_pwm_bl_probe(struct platform_device *pdev)
 	struct atmel_pwm_bl *pwmbl;
 	int retval;
 
+	pdata = dev_get_platdata(&pdev->dev);
+	if (!pdata)
+		return -ENODEV;
+
+	if (pdata->pwm_compare_max < pdata->pwm_duty_max ||
+			pdata->pwm_duty_min > pdata->pwm_duty_max ||
+			pdata->pwm_frequency == 0)
+		return -EINVAL;
+
 	pwmbl = devm_kzalloc(&pdev->dev, sizeof(struct atmel_pwm_bl),
 				GFP_KERNEL);
 	if (!pwmbl)
 		return -ENOMEM;
 
 	pwmbl->pdev = pdev;
-
-	pdata = dev_get_platdata(&pdev->dev);
-	if (!pdata) {
-		retval = -ENODEV;
-		goto err_free_mem;
-	}
-
-	if (pdata->pwm_compare_max < pdata->pwm_duty_max ||
-			pdata->pwm_duty_min > pdata->pwm_duty_max ||
-			pdata->pwm_frequency == 0) {
-		retval = -EINVAL;
-		goto err_free_mem;
-	}
-
 	pwmbl->pdata = pdata;
 	pwmbl->gpio_on = pdata->gpio_on;
 
 	retval = pwm_channel_alloc(pdata->pwm_channel, &pwmbl->pwmc);
 	if (retval)
-		goto err_free_mem;
+		return retval;
 
 	if (pwmbl->gpio_on != -1) {
 		retval = devm_gpio_request(&pdev->dev, pwmbl->gpio_on,
 					"gpio_atmel_pwm_bl");
-		if (retval) {
-			pwmbl->gpio_on = -1;
+		if (retval)
 			goto err_free_pwm;
-		}
 
 		/* Turn display off by default. */
 		retval = gpio_direction_output(pwmbl->gpio_on,
@@ -197,7 +190,7 @@ static int atmel_pwm_bl_probe(struct platform_device *pdev)
 
 err_free_pwm:
 	pwm_channel_free(&pwmbl->pwmc);
-err_free_mem:
+
 	return retval;
 }