Fix crash during UDP segmentation due to stack garbage

[cgutman]

Description

Trivial fix for bug I discovered while testing #1692 on Ubuntu 22.04. I have no idea how this escaped detection until now. We must have just been getting lucky before and the stack happened to be zeroed or something.

Screenshot

Issues Fixed or Closed

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Dependency update (updates to dependencies)
• Documentation update (changes to documentation)
• Repository update (changes to repository files, e.g. .github/...)

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have added or updated the in code docstring/documentation-blocks for new or existing methods/components

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Allow edits from maintainers.

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