gpio: 74x164: Use spi_write() helper instead of open coding

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
diff --git a/drivers/gpio/gpio-74x164.c b/drivers/gpio/gpio-74x164.c
index 80f9ddf..a6607fa 100644
--- a/drivers/gpio/gpio-74x164.c
+++ b/drivers/gpio/gpio-74x164.c
@@ -35,13 +35,8 @@
 
 static int __gen_74x164_write_config(struct gen_74x164_chip *chip)
 {
-	struct spi_transfer xfer = {
-		.tx_buf = chip->buffer,
-		.len = chip->registers,
-	};
-
-	return spi_sync_transfer(to_spi_device(chip->gpio_chip.parent),
-				 &xfer, 1);
+	return spi_write(to_spi_device(chip->gpio_chip.parent), chip->buffer,
+			 chip->registers);
 }
 
 static int gen_74x164_get_value(struct gpio_chip *gc, unsigned offset)