pwm: lpc18xx-sct: Drop hardly used member from driver private data

The device pointer is only used once in lpc18xx_pwm_request(). There the
pwm_chip is available, too, which has a pointer to the same structure.
Replace the usage accordingly and drop the then write-only member
variable.

Link: https://lore.kernel.org/r/427a719a24dd7ff5ebbac3e260a1773c094c7489.1707900770.git.u.kleine-koenig@pengutronix.deSigned-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>

drivers/pwm/pwm-lpc18xx-sct.c

@@ -92,7 +92,6 @@ struct lpc18xx_pwm_data {
 };
 
 struct lpc18xx_pwm_chip {
-	struct device *dev;
 	struct pwm_chip chip;
 	void __iomem *base;
 	struct clk *pwm_clk;
@@ -289,7 +288,7 @@ static int lpc18xx_pwm_request(struct pwm_chip *chip, struct pwm_device *pwm)
 				    LPC18XX_PWM_EVENT_MAX);
 
 	if (event >= LPC18XX_PWM_EVENT_MAX) {
-		dev_err(lpc18xx_pwm->dev,
+		dev_err(chip->dev,
 			"maximum number of simultaneous channels reached\n");
 		return -EBUSY;
 	}
@@ -358,8 +357,6 @@ static int lpc18xx_pwm_probe(struct platform_device *pdev)
 	if (!lpc18xx_pwm)
 		return -ENOMEM;
 
-	lpc18xx_pwm->dev = &pdev->dev;
-
 	lpc18xx_pwm->base = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(lpc18xx_pwm->base))
 		return PTR_ERR(lpc18xx_pwm->base);