Fixes SD begin() end() memory leak espressif#2897 (espressif#5419)

Author: SuGlider

libraries/SD/src/sd_diskio.cpp

@@ -703,6 +703,7 @@ uint8_t sdcard_uninit(uint8_t pdrv)
  esp_err_t err = ESP_OK;
  if (card->base_path) {
  err = esp_vfs_fat_unregister_path(card->base_path);
+ free(card->base_path);
  }
  free(card);
  return err;