[CBM] Potential misclasification of incremental backups

// setBackupType - Uses the given data ranges to determine what type of backup is going to be created, and then updates

// the backups '.info' file.

func (s *Sink) setBackupType(dr value.DataRanges) error {

	var (

		err error

		full = true

	)

	dr.ForEach(nil, func(_ uint16, vbDR *value.DataRange) error { //nolint:errcheck

		full = full &&

			(len(vbDR.Sink.Initial.Snapshots) == 0 &&

				vbDR.Sink.Initial.HighSeqNo == 0 &&

				vbDR.Sink.Initial.PurgeSeqNo == 0 &&

				len(vbDR.Sink.Initial.FailoverLog) == 0)

		return nil

	})

	if full {

		err = s.backup.setBackupType(value.FullBackup)

	} else {

		err = s.backup.setBackupType(value.IncrementalBackup)

	}

	// <snip>

}

// setBackupType - Sets the 'type' field in the backups '.info' file. If the 'field' is already set to 'INCR' and the

// requested type is 'FULL' this function will return <nil> but will not update the backup type.

func (bd *backupDir) setBackupType(backupType string) error {

	// This function will be called for each bucket in the backup. If any of the buckets in the backup are incrementals

	// the whole backup is classed as an incremental.

	if bd.bInfo.Type == value.IncrementalBackup && backupType == value.FullBackup {

		return nil

	}

	// <snip>

}

func (s *Sink) setBackupType(dr value.DataRanges) error {

	// We've already set the backup type, exit early

	if s.backupTypeSet {

		return nil

	}

	// <snip>

	s.backupTypeSet = true

	return nil

}