pwm-sun4i: Convert "next_period" to local variable

Its value is calculated in sun4i_pwm_apply() and is used only there.
Signed-off-by: Max Kellermann <max.kellermann@gmail.com>
Reviewed-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>

drivers/pwm/pwm-sun4i.c

@@ -89,7 +89,6 @@ struct sun4i_pwm_chip {
 	void __iomem *base;
 	spinlock_t ctrl_lock;
 	const struct sun4i_pwm_data *data;
-	unsigned long next_period[2];
 };
 
 static inline struct sun4i_pwm_chip *to_sun4i_pwm_chip(struct pwm_chip *chip)
@@ -237,6 +236,7 @@ static int sun4i_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
 	int ret;
 	unsigned int delay_us, prescaler = 0;
 	unsigned long now;
+	unsigned long next_period;
 	bool bypass;
 
 	pwm_get_state(pwm, &cstate);
@@ -284,7 +284,7 @@ static int sun4i_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
 
 	val = (duty & PWM_DTY_MASK) | PWM_PRD(period);
 	sun4i_pwm_writel(sun4i_pwm, val, PWM_CH_PRD(pwm->hwpwm));
-	sun4i_pwm->next_period[pwm->hwpwm] = jiffies +
+	next_period = jiffies +
 		nsecs_to_jiffies(cstate.period + 1000);
 
 	if (state->polarity != PWM_POLARITY_NORMAL)
@@ -306,9 +306,8 @@ static int sun4i_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
 
 	/* We need a full period to elapse before disabling the channel. */
 	now = jiffies;
-	if (time_before(now, sun4i_pwm->next_period[pwm->hwpwm])) {
-		delay_us = jiffies_to_usecs(sun4i_pwm->next_period[pwm->hwpwm] -
-					   now);
+	if (time_before(now, next_period)) {
+		delay_us = jiffies_to_usecs(next_period - now);
 		if ((delay_us / 500) > MAX_UDELAY_MS)
 			msleep(delay_us / 1000 + 1);
 		else