staging: greybus: gpio: Replace macro irq_data_to_gpio_chip with function

Replace the macro irq_data_to_gpio_chip with a static inline function to comply
with Linux coding style standards.
Signed-off-by: Brent Pappas <bpappas@pappasbrent.com>
Link: https://lore.kernel.org/r/20230117152857.22141-1-bpappas@pappasbrent.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/greybus/gpio.c

@@ -43,7 +43,11 @@ struct gb_gpio_controller {
 };
 #define gpio_chip_to_gb_gpio_controller(chip) \
 	container_of(chip, struct gb_gpio_controller, chip)
-#define irq_data_to_gpio_chip(d) (d->domain->host_data)
+
+static struct gpio_chip *irq_data_to_gpio_chip(struct irq_data *d)
+{
+	return d->domain->host_data;
+}
 
 static int gb_gpio_line_count_operation(struct gb_gpio_controller *ggc)
 {