pwm: ntxec: Drop useless assignment to struct pwmchip::base

Since commit f9a8ee8c ("pwm: Always allocate PWM chip base ID
dynamically") there is no effect any more for assigning this variable.
When the patch resulting in f9a8ee8c was created, this driver didn't
exist yet, so this was missed.
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>

drivers/pwm/pwm-ntxec.c

@@ -155,7 +155,6 @@ static int ntxec_pwm_probe(struct platform_device *pdev)
 	chip = &priv->chip;
 	chip->dev = &pdev->dev;
 	chip->ops = &ntxec_pwm_ops;
-	chip->base = -1;
 	chip->npwm = 1;
 
 	return pwmchip_add(chip);