esp_wifi: fix WiFi deinit memory leak

components/esp_wifi/include/esp_private/wifi.h

@@ -102,6 +102,23 @@ typedef enum {
  */
 esp_err_t esp_wifi_init_internal(const wifi_init_config_t *config);
 
+/**
+ * @brief Deinitialize Wi-Fi Driver
+ *     Free resource for WiFi driver, such as WiFi control structure, RX/TX buffer,
+ *     WiFi NVS structure among others.
+ *
+ * For the most part, you need not call this function directly. It gets called
+ * from esp_wifi_deinit().
+ *
+ * This function may be called, if you call esp_wifi_init_internal to initialize
+ * WiFi driver.
+ *
+ * @return
+ *    - ESP_OK: succeed
+ *    - others: refer to error code esp_err.h
+ */
+esp_err_t esp_wifi_deinit_internal(void);
+
 /**
   * @brief  get whether the wifi driver is allowed to transmit data or not
   *