[17267] Added missing mutex to WLP::remove_local_reader

[jsan-rt]

WLP::add_local_reader takes the PDP mutex to protect the reader collection. WLP::remove_local_reader should take the same mutex to prevent simultaneous addition/removal from the same container.

Description

@Mergifyio backport 2.9.x 2.8.x

Fixes #3304

Contributor Checklist

• Commit messages follow the project guidelines.
• The code follows the style guidelines of this project.
• [NA] 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
• [NA] Any new/modified methods have been properly documented using Doxygen.
• Changes are ABI compatible.
• Changes are API compatible.
• [NA] New feature has been added to the versions.md file (if applicable).
• [NA] New feature has been documented/Current behavior is correctly described in the documentation.
• Applicable backports have been included in the description.

Reviewer Checklist

• The PR has a milestone assigned.
• Check contributor checklist is correct.
• Check CI results: changes do not issue any warning.
• Check CI results: failing tests are unrelated with the changes.

[Mario-DL]

LGTM. Failed tests are not related with the changes

[jsan-rt]

@Mergifyio backport 2.9.x 2.8.x 2.6.x

[mergify]

backport 2.9.x 2.8.x 2.6.x

✅ Backports have been created

• #3370 [17267] Added missing mutex to WLP::remove_local_reader (backport #3311) has been created for branch 2.9.x
• #3371 [17267] Added missing mutex to WLP::remove_local_reader (backport #3311) has been created for branch 2.8.x
• #3372 [17267] Added missing mutex to WLP::remove_local_reader (backport #3311) has been created for branch 2.6.x