pwm: Simplify pwm_capture()

When pwm_capture() is called, pwm is valid, so the checks for pwm and
pwm->chip->ops being NULL can be dropped.
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@baylibre.com>
Link: https://lore.kernel.org/r/ee7b3322c7b3e28defdfb886a70b8ba40d298416.1722261050.git.u.kleine-koenig@baylibre.comSigned-off-by: Uwe Kleine-König <ukleinek@kernel.org>

drivers/pwm/core.c

@@ -328,15 +328,15 @@ EXPORT_SYMBOL_GPL(pwm_adjust_config);
 static int pwm_capture(struct pwm_device *pwm, struct pwm_capture *result,
 		       unsigned long timeout)
 {
-	if (!pwm || !pwm->chip->ops)
-		return -EINVAL;
+	struct pwm_chip *chip = pwm->chip;
+	const struct pwm_ops *ops = chip->ops;
 
-	if (!pwm->chip->ops->capture)
+	if (!ops->capture)
 		return -ENOSYS;
 
 	guard(mutex)(&pwm_lock);
 
-	return pwm->chip->ops->capture(pwm->chip, pwm, result, timeout);
+	return ops->capture(chip, pwm, result, timeout);
 }
 
 static struct pwm_chip *pwmchip_find_by_name(const char *name)