lwIP | Backport shared networking error passthrough (#9)

[Kinsey Moore (@opticron)]

Kinsey Moore created an issue: https://gitlab.rtems.org/rtems/pkg/rtems-lwip/-/issues/9



## Summary
MR !24 contained a bug fix that needs backporting to the 6 branch for error passthrough in the shared network startup code.


## Steps to reproduce


### Pre-set options

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View it on GitLab: https://gitlab.rtems.org/rtems/pkg/rtems-lwip/-/issues/9
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