|SUCCESS| test: remove unneeded null check before free

[dpdklab at iol.unh.edu]

Test-Label: ai-code-review
Test-Status: SUCCESS
https://dpdk.org/patch/170511

_AI Code Review_

=== Patch Review: series.patch (via Claude) ===
Review date: 2026-10-02

# DPDK Patch Review

## Patch: test: remove unneeded null check before free

### Summary
This patch removes an unnecessary NULL check before calling `rte_pktmbuf_free()` in the test code. The change is mechanically correct, as `rte_pktmbuf_free()` handles NULL pointers safely.

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## Findings

### Errors
None.

### Warnings
None.

### Info

**Correctness verification:**
The patch is correct. `rte_pktmbuf_free()` handles NULL pointers safely (it checks internally and returns early if the mbuf is NULL), so the explicit NULL check is redundant.

**Code quality:**
This is a cleanup patch that removes unnecessary defensive code. The coccinelle script correctly identified this pattern.

**Style compliance:**
- The change follows DPDK coding standards
- Reduces unnecessary code as per the "Unnecessary Code Patterns" section of the guidelines

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## Overall Assessment

**LGTM** - The patch is correct and improves code quality by removing unnecessary defensive checks. No issues found.

The patch:
-  Removes redundant NULL check (rte_pktmbuf_free handles NULL)
-  Test-only change (no release notes needed)
-  Follows coding standards
-  No correctness issues introduced