Fix parser tcpoptions

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Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 40.53%. Comparing base (3717722) to head (20b887e).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #218 +/- ## ========================================== + Coverage 40.51% 40.53% +0.01% ========================================== Files 104 104 Lines 10102 10102 Branches 1493 1492 -1 ========================================== + Hits 4093 4095 +2 + Misses 5145 5143 -2 Partials 864 864 ``` | [Flag](https://app.codecov.io/gh/CESNET/ipfixprobe/pull/218/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=CESNET) | Coverage Δ | | |---|---|---| | [tests](https://app.codecov.io/gh/CESNET/ipfixprobe/pull/218/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=CESNET) | `40.53% <100.00%> (+0.01%)` | :arrow_up: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=CESNET#carryforward-flags-in-the-pull-request-comment) to find out more.

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