Fix line wrapping for btsnooz

  uint8_t b64_in[3] = {0};

  char b64_out[5] = {0};

  size_t i = sizeof(btsnooz_preamble_t);

  size_t line_length = 0;

  while (ringbuffer_size(ringbuffer) > 0) {

    size_t read = ringbuffer_pop(ringbuffer, b64_in, 3);

    if (i > 0 && i % MAX_LINE_LENGTH == 0)

    if (line_length >= MAX_LINE_LENGTH) {

      dprintf(fd, "\n");

    i += b64_ntop(b64_in, read, b64_out, 5);

      line_length = 0;

    }

    line_length += b64_ntop(b64_in, read, b64_out, 5);

    dprintf(fd, "%s", b64_out);

  }

  dprintf(fd, "\n--- END:BTSNOOP_LOG_SUMMARY (%zu bytes out) ---\n", i);

  dprintf(fd, "\n--- END:BTSNOOP_LOG_SUMMARY ---\n");

error:

  ringbuffer_free(ringbuffer);