staging: greybus: Inline pwm_chip_to_gb_pwm_chip()

Convert 'pwm_chip_to_gb_pwm_chip' from a macro to a static
inline function, to make the relevant types apparent in the
definition and to benefit from the type checking performed by
the compiler at call sites.
Signed-off-by: Sumitra Sharma <sumitraartsy@gmail.com>
Link: https://lore.kernel.org/r/20230326064519.GA179449@sumitra.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/greybus/pwm.c

@@ -21,8 +21,11 @@ struct gb_pwm_chip {
 	struct pwm_chip		chip;
 	struct pwm_chip		*pwm;
 };
-#define pwm_chip_to_gb_pwm_chip(chip) \
-	container_of(chip, struct gb_pwm_chip, chip)
+
+static inline struct gb_pwm_chip *pwm_chip_to_gb_pwm_chip(struct pwm_chip *chip)
+{
+	return container_of(chip, struct gb_pwm_chip, chip);
+}
 
 static int gb_pwm_count_operation(struct gb_pwm_chip *pwmc)
 {