1. Are you opening this pull request for bug-fixes, optimizations or new feature?

bug-fixes

2. Please describe how these code changes achieve your intention.

The code was modified at the suggestion of the author。

3. Please link to the relevant issues (if any).

615

4. Which documentation changes (if any) need to be made/updated because of this PR?

nothing

4. Checklist

[x] I have squashed all insignificant commits.
[x] I have commented my code for explaining package types, values, functions, and non-obvious lines.
[ ] I have written unit tests and verified that all tests passes (if needed).
[ ] I have documented feature info on the README (only when this PR is adding a new feature).
[x] (optional) I am willing to help maintain this change if there are issues with it later.

Codecov Report

Attention: Patch coverage is 25.00000% with 3 lines in your changes missing coverage. Please review.

Project coverage is 79.43%. Comparing base (5346527) to head (6269155).

Files	Patch %	Lines
connection_unix.go	25.00%	2 Missing and 1 partial :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## dev #616 +/- ## ========================================== - Coverage 79.58% 79.43% -0.15% ========================================== Files 21 21 Lines 2106 2106 ========================================== - Hits 1676 1673 -3 - Misses 298 300 +2 - Partials 132 133 +1 ``` | [Flag](https://app.codecov.io/gh/panjf2000/gnet/pull/616/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Andy+Pan) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/panjf2000/gnet/pull/616/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Andy+Pan) | `79.43% <25.00%> (-0.15%)` | :arrow_down: | 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=Andy+Pan#carryforward-flags-in-the-pull-request-comment) to find out more.

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panjf2000 / gnet

bug: fix Conn.Next and Conn.Peek panic On Unix #616