acer-wmi: Cleanup the failure cleanup handling

Cleanup the failure cleanup handling for brightness and email led.

[cc: Split out from another patch]
Signed-off-by: Andy Whitcroft <apw@canonical.com>
Signed-off-by: Carlos Corbacho <carlos@strangeworlds.co.uk>
Signed-off-by: Len Brown <len.brown@intel.com>

drivers/platform/x86/acer-wmi.c

@@ -1136,11 +1136,17 @@ static int __devinit acer_platform_probe(struct platform_device *device)
 	}
 
 	err = acer_rfkill_init(&device->dev);
+	if (err)
+		goto error_rfkill;
 
 	return err;
 
+error_rfkill:
+	if (has_cap(ACER_CAP_BRIGHTNESS))
+		acer_backlight_exit();
 error_brightness:
-	acer_led_exit();
+	if (has_cap(ACER_CAP_MAILLED))
+		acer_led_exit();
 error_mailled:
 	return err;
 }