leds: lp3952: Use 'if (ret)' pattern

Instead of unusual "if (!ret)" use "if (ret)" in lp3952_get_label().

Signed-off-by: Andy Shevchenko <[e-mail]>
Signed-off-by: Jacek Anaszewski <[e-mail]>

drivers/leds/leds-lp3952.c

···
 	const char *str;
 
 	ret = device_property_read_string(dev, label, &str);
-	if (!ret)
-		strncpy(dest, str, LP3952_LABEL_MAX_LEN);
+	if (ret)
+		return ret;
 
-	return ret;
+	strncpy(dest, str, LP3952_LABEL_MAX_LEN);
+	return 0;
 }
 
 static int lp3952_register_led_classdev(struct lp3952_led_array *priv)