leds: leds-pwm: return proper error if pwm_request failed

Return PTR_ERR(led_dat->pwm) instead of 0 if pwm_request failed
Signed-off-by: Axel Lin <axel.lin@gmail.com>
Cc: Richard Purdie <rpurdie@rpsys.net>
Cc: Luotao Fu <l.fu@pengutronix.de>
Cc: Reviewed-by: Dmitry Torokhov <dtor@mail.ru>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

drivers/leds/leds-pwm.c

@@ -69,6 +69,7 @@ static int led_pwm_probe(struct platform_device *pdev)
 		led_dat->pwm = pwm_request(cur_led->pwm_id,
 				cur_led->name);
 		if (IS_ERR(led_dat->pwm)) {
+			ret = PTR_ERR(led_dat->pwm);
 			dev_err(&pdev->dev, "unable to request PWM %d\n",
 					cur_led->pwm_id);
 			goto err;