gpio: fix memory leak in aspeed_gpio_init()

Address Sanitizer shows memory leak in hw/gpio/aspeed_gpio.c:875

Reported-by: Euler Robot <euler.robot@huawei.com>
Signed-off-by: PanNengyuan <pannengyuan@huawei.com>
Reviewed-by: Cédric Le Goater <clg@kaod.org>
Signed-off-by: Cédric Le Goater <clg@kaod.org>
Message-id: 20191119141211.25716-16-clg@kaod.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

hw/gpio/aspeed_gpio.c

@@ -876,6 +876,7 @@ static void aspeed_gpio_init(Object *obj)
                                pin_idx % GPIOS_PER_GROUP);
         object_property_add(obj, name, "bool", aspeed_gpio_get_pin,
                             aspeed_gpio_set_pin, NULL, NULL, NULL);
+        g_free(name);
     }
 }