lwIP | embeddedsw/emacps: Backport iteration limit fix (!36)

[Kinsey Moore (@opticron)]

Kinsey Moore created a merge request: https://gitlab.rtems.org/rtems/pkg/rtems-lwip/-/merge_requests/36

Project:Branches: opticron/rtems-lwip:br6-bdring-fixes to rtems/pkg/rtems-lwip:6
Author:   Kinsey Moore
Assignee: Kinsey Moore



## Summary

embeddedsw/emacps: Backport iteration limit fix

Prevent iterating beyond the buffer descriptor ring tail node. Iterating
over the tail node can cause unexpected behavior such as failure to send
and receive further packets.

Closes #11


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