fix(button): Added initialization for gpio_config

Author: victorfleischauer

components/button/button_gpio.c

@@ -88,7 +88,7 @@ esp_err_t iot_button_new_gpio_device(const button_config_t *button_config, const
     gpio_btn->active_level = gpio_cfg->active_level;
     gpio_btn->enable_power_save = gpio_cfg->enable_power_save;
 
-    gpio_config_t gpio_conf;
+    gpio_config_t gpio_conf = {0};
     gpio_conf.intr_type = GPIO_INTR_DISABLE;
     gpio_conf.mode = GPIO_MODE_INPUT;
     gpio_conf.pin_bit_mask = (1ULL << gpio_cfg->gpio_num);