pwm: Make chip parameter to pwmchip_get_drvdata() a const pointer

dev_get_drvdata()'s parameter is a const pointer, so the chip passed to
pwmchip_get_drvdata() can be const, too.

Signed-off-by: Uwe Kleine-König <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Uwe Kleine-König <[email protected]>

Author: ukleinek

include/linux/pwm.h

@@ -369,7 +369,7 @@ static inline struct device *pwmchip_parent(const struct pwm_chip *chip)
 	return chip->dev.parent;
 }
 
-static inline void *pwmchip_get_drvdata(struct pwm_chip *chip)
+static inline void *pwmchip_get_drvdata(const struct pwm_chip *chip)
 {
 	return dev_get_drvdata(&chip->dev);
 }