Fix an uninitialized value when building with gcc 13.2.0

[clalancette]

Description

This fix already exists on master, so this is a backport of just this fix onto 2.11.x. This gets rid of a possible use of an uninitialized value warning when building with gcc 13.2.0

Partial backport of #3828

Contributor Checklist

• Commit messages follow the project guidelines.
• The code follows the style guidelines of this project.
• [N/A] Tests that thoroughly check the new feature have been added/Regression tests checking the bug and its fix have been added; the added tests pass locally
• [N/A] Any new/modified methods have been properly documented using Doxygen.
• Changes are ABI compatible.
• Changes are API compatible.
• [N/A] New feature has been added to the versions.md file (if applicable).
• [N/A] New feature has been documented/Current behavior is correctly described in the documentation.
• [N/A] Applicable backports have been included in the description.

Reviewer Checklist

• The PR has a milestone assigned.
• The title and description correctly express the PR's purpose.
• Check contributor checklist is correct.
• Check CI results: changes do not issue any warning.
• Check CI results: failing tests are unrelated with the changes.

[MiguelCompany]

@clalancette thanks!