Bug #116445 recv_sys->scanned_epoch_no lost assignment when parse_start_lsn is first set

Description:
In the function recv_scan_log_recs, recv_sys->scanned_epoch_no lost the first assignment when recv_sys->parse_start_lsn is first set.

How to repeat:
Read the codes directly.
```c++
#ifndef UNIV_HOTBACKUP
static bool recv_scan_log_recs(log_t &log,
#else  /* !UNIV_HOTBACKUP */
bool meb_scan_log_recs(
#endif /* !UNIV_HOTBACKUP */
                               size_t max_memory, const byte *buf, size_t len,
                               lsn_t start_lsn, lsn_t *read_upto_lsn) {
  ...
    if (!recv_sys->parse_start_lsn && block_header.m_first_rec_group > 0) {
      ...
      recv_sys->scanned_lsn = recv_sys->parse_start_lsn;
      /* Here lost the assignment of recv_sys->scanned_epoch_no */
      recv_sys->recovered_lsn = recv_sys->parse_start_lsn;
      ...
    }
  ...
}
```

Bug116445.diff

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Bug116445.diff

(*) I confirm the code being submitted is offered under the terms of the OCA, and that I am authorized to contribute it.

Contribution: Bug116445.diff (application/octet-stream, text), 480 bytes.

Hello mengchu shi,

Thank you for the report and contribution.

regards,
Umesh