|SUCCESS| devtools: ignore context lines in check-symbol-change.py

[dpdklab at iol.unh.edu]

Test-Label: ai-code-review
Test-Status: SUCCESS
https://dpdk.org/patch/172372

_AI Code Review_

=== Patch Review: series.patch (via Claude) ===
Review date: 2026-11-03

# Review of patch: devtools: ignore context lines in check-symbol-change.py

## ERRORS

None identified.

## WARNINGS

None identified.

## INFO

The patch correctly fixes a bug in the symbol change detection script where context lines (starting with space) were incorrectly matched as symbol additions/removals. The fix is minimal and correct: restricting the regex patterns to only match lines that start with `+` or `-` (actual diff additions/removals) rather than any character.

The change is appropriately scoped to a development tool script and does not affect any DPDK runtime code, API, or ABI.

Review-Result: CLEAN