esp_ota_end() function

- ESP_OK: Newly written OTA app image is valid. - ESP_ERR_NOT_FOUND: OTA handle was not found. - ESP_ERR_INVALID_ARG: Handle was never written to. - ESP_ERR_OTA_VALIDATE_FAILED: OTA image is invalid (either not a valid app image, or - if secure boot is enabled - signature failed to verify.) - ESP_ERR_INVALID_STATE: If flash encryption is enabled, this result indicates an internal error writing the final encrypted bytes to flash.

After calling esp_ota_end(), the handle is no longer valid and any memory associated with it is freed (regardless of result).