Fix resetting fifo alignment when datagrams are consumed

[danielinux]

No description provided.

[Copilot]

Pull request overview

Fixes FIFO tail alignment behavior when the FIFO is empty (tail == head), preventing state from being mutated during empty reads and adding regression coverage around odd-sized datagrams and UDP receive ordering.

Changes:

• Prevent fifo_align_tail() from adjusting tail when the FIFO is empty.
• Add FIFO unit tests for empty/un-aligned tail behavior and odd-sized push/pop draining.
• Add an integration test covering UDP recv/recvfrom sequencing to catch alignment regressions.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 3 comments.

File	Description
src/wolfip.c	Avoids mutating FIFO tail alignment when tail == head (empty FIFO).
src/test/unit/unit.c	Adds regression tests to ensure FIFO empty operations don’t realign tail and UDP reads remain correct across odd payload sizes.

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[philljj]

Thank you!