Fix the leak of RGBA buffer when WebPDecode failed

[therehello]

Also fix the unbalanced #if SD_MAC braces which broke the macOS test compile.

Summary by CodeRabbit

• Bug Fixes

  • Fixed a memory leak that could occur when decoding invalid or unsupported WebP image data.

• Tests

  • Corrected platform-specific test conditions to ensure WebP decoding behavior is validated consistently across supported environments.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: e47b5f4d-98f7-4698-89ee-1b13ba2e0f72

📥 Commits

Reviewing files that changed from the base of the PR and between 12d83ed and 74b78eb.

📒 Files selected for processing (2)

• SDWebImageWebPCoder/Classes/SDImageWebPCoder.m
• Tests/SDWebImageWebPCoderTests.m

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📝 Walkthrough

Walkthrough

The WebP decoder now frees its RGBA buffer when WebPDecode fails. The related test adjusts conditional compilation boundaries so its runtime fallback is outside the SD_MAC block.

Changes

WebP decode maintenance

Layer / File(s)	Summary
Release RGBA buffer on decode failure SDWebImageWebPCoder/Classes/SDImageWebPCoder.m	The WebPDecode failure branch calls WebPFree(rgba) before returning nil.
Correct test conditional scope Tests/SDWebImageWebPCoderTests.m	The SD_MAC conditional block now ends before the runtime else fallback in the WebP decode test.

Estimated code review effort: 1 (Trivial) | ~5 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly matches the main change: fixing the RGBA buffer leak on WebPDecode failure.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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