hwmon: (npcm750-pwm) Add an error code check in npcm7xx_en_pwm_fan

npcm7xx_pwm_config_set() can return '-ENODEV' for failed. So check
the value of 'ret' after calling npcm7xx_pwm_config_set().
Signed-off-by: Su Hui <suhui@nfschina.com>
Link: https://lore.kernel.org/r/20231020085518.198477-1-suhui@nfschina.comSigned-off-by: Guenter Roeck <linux@roeck-us.net>

drivers/hwmon/npcm750-pwm-fan.c

@@ -875,6 +875,8 @@ static int npcm7xx_en_pwm_fan(struct device *dev,
 	data->pwm_present[pwm_port] = true;
 	ret = npcm7xx_pwm_config_set(data, pwm_port,
 				     NPCM7XX_PWM_CMR_DEFAULT_NUM);
+	if (ret)
+		return ret;
 
 	ret = of_property_count_u8_elems(child, "cooling-levels");
 	if (ret > 0) {