gpio: squelch a compiler warning

drivers/gpio/gpiolib-of.c: In function 'of_gpiochip_find_and_xlate':
drivers/gpio/gpiolib-of.c:52:21: warning: assignment makes integer from pointer without a cast [enabled by default]
   gg_data->out_gpio = ERR_PTR(ret);
                     ^
This was introduced in 72464765, a
backport of upstream commit 7b8792bb.

The upstream kernel changed the type of out_gpio from int to struct gpio_desc *
as part of a larger refactoring that wasn't backported
Signed-off-by: Martin Kaiser <martin@kaiser.cx>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>

drivers/gpio/gpiolib-of.c

@@ -49,7 +49,7 @@ static int of_gpiochip_find_and_xlate(struct gpio_chip *gc, void *data)
 		 * Return false to keep looking, as more than one gpio chip
 		 * could be registered per of-node.
 		 */
-		gg_data->out_gpio = ERR_PTR(ret);
+		gg_data->out_gpio = ret;
 		return false;
 	 }