gpio: remove unneeded initializer in gpiochip_add_to_list()

This variable is used as an iterator and initialized in the
list_for_each() loop.
Signed-off-by: NMasahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>

drivers/gpio/gpiolib.c

@@ -190,7 +190,7 @@ EXPORT_SYMBOL_GPL(gpiod_get_direction);
  */
 static int gpiochip_add_to_list(struct gpio_chip *chip)
 {
-	struct list_head *pos = &gpio_chips;
+	struct list_head *pos;
 	struct gpio_chip *_chip;
 	int err = 0;