pwm: atmel-tcb: Unroll atmel_tcb_pwm_set_polarity() into only caller

atmel_tcb_pwm_set_polarity() is only called once and effectively wraps
an assignment only. Replace the function call by the respective
assignment.
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Reviewed-by: Claudiu Beznea <claudiu.beznea@tuxon.dev>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>

drivers/pwm/pwm-atmel-tcb.c

@@ -67,18 +67,6 @@ static inline struct atmel_tcb_pwm_chip *to_tcb_chip(struct pwm_chip *chip)
 	return container_of(chip, struct atmel_tcb_pwm_chip, chip);
 }
 
-static int atmel_tcb_pwm_set_polarity(struct pwm_chip *chip,
-				      struct pwm_device *pwm,
-				      enum pwm_polarity polarity)
-{
-	struct atmel_tcb_pwm_chip *tcbpwmc = to_tcb_chip(chip);
-	struct atmel_tcb_pwm_device *tcbpwm = &tcbpwmc->pwms[pwm->hwpwm];
-
-	tcbpwm->polarity = polarity;
-
-	return 0;
-}
-
 static int atmel_tcb_pwm_request(struct pwm_chip *chip,
 				 struct pwm_device *pwm)
 {
@@ -356,11 +344,12 @@ static int atmel_tcb_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
 static int atmel_tcb_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
 			       const struct pwm_state *state)
 {
+	struct atmel_tcb_pwm_chip *tcbpwmc = to_tcb_chip(chip);
+	struct atmel_tcb_pwm_device *tcbpwm = &tcbpwmc->pwms[pwm->hwpwm];
 	int duty_cycle, period;
 	int ret;
 
-	/* This function only sets a flag in driver data */
-	atmel_tcb_pwm_set_polarity(chip, pwm, state->polarity);
+	tcbpwm->polarity = state->polarity;
 
 	if (!state->enabled) {
 		atmel_tcb_pwm_disable(chip, pwm);