gpio: gpiolib-of.c: fix checkpatch error

Fix :
 gpio/gpiolib-of.c:64: ERROR: code indent should use tabs where possible

Signed-off-by: Laurent Navet <laurent.navet@gmail.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
diff --git a/drivers/gpio/gpiolib-of.c b/drivers/gpio/gpiolib-of.c
index a71a54a..8940793 100644
--- a/drivers/gpio/gpiolib-of.c
+++ b/drivers/gpio/gpiolib-of.c
@@ -61,7 +61,7 @@
  * in flags for the GPIO.
  */
 int of_get_named_gpio_flags(struct device_node *np, const char *propname,
-                           int index, enum of_gpio_flags *flags)
+			   int index, enum of_gpio_flags *flags)
 {
 	/* Return -EPROBE_DEFER to support probe() functions to be called
 	 * later when the GPIO actually becomes available