lwIP | Update to lwIP 2.2.1 and fix minor bug (!24)

[Kinsey Moore (@opticron)]

Kinsey Moore created a merge request: https://gitlab.rtems.org/rtems/pkg/rtems-lwip/-/merge_requests/24

Project:Branches: opticron/rtems-lwip:brmain-update-lwip to rtems/pkg/rtems-lwip:main
Author:   Kinsey Moore
Assignee: Kinsey Moore



## Summary

Fix an issue with an error return being ignored and update to lwIP 2.2.1.

Closes #6 

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View it on GitLab: https://gitlab.rtems.org/rtems/pkg/rtems-lwip/-/merge_requests/24
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