pwm: bcm-kona: Consistently name pwm_chip variables "chip"

Most variables holding a pointer to a pwm_chip are called "chip" which
is also the usual name in most other PWM drivers. Rename the single
variable that have a different name to be called "chip", too, for
consistency.
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>

drivers/pwm/pwm-bcm-kona.c

@@ -61,9 +61,9 @@ struct kona_pwmc {
 	struct clk *clk;
 };
 
-static inline struct kona_pwmc *to_kona_pwmc(struct pwm_chip *_chip)
+static inline struct kona_pwmc *to_kona_pwmc(struct pwm_chip *chip)
 {
-	return container_of(_chip, struct kona_pwmc, chip);
+	return container_of(chip, struct kona_pwmc, chip);
 }
 
 /*