pwm: meson: Drop always false check from .apply()

The PWM core only calls the apply callback with a valid state pointer,
so don't repeat this check already done in the core.
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Reviewed-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>

drivers/pwm/pwm-meson.c

@@ -265,9 +265,6 @@ static int meson_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
 	struct meson_pwm_channel *channel = &meson->channels[pwm->hwpwm];
 	int err = 0;
 
-	if (!state)
-		return -EINVAL;
-
 	if (!state->enabled) {
 		if (state->polarity == PWM_POLARITY_INVERSED) {
 			/*