gpio: of: add missing of_node_put() to of_gpiochip_add_pin_range()

As the comment block of of_parse_phandle_with_fixed_args() says,
the caller is responsible to call of_node_put() on the returned
node when done.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.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 d22dcc3..d8c36c1 100644
--- a/drivers/gpio/gpiolib-of.c
+++ b/drivers/gpio/gpiolib-of.c
@@ -409,6 +409,7 @@
 			break;
 
 		pctldev = of_pinctrl_get(pinspec.np);
+		of_node_put(pinspec.np);
 		if (!pctldev)
 			return -EPROBE_DEFER;