Fix double free

[ralwing]

Related Issues & PRs

Fix the double free error mentioned
ouster-lidar/ouster-ros#486
It's a copy of PR:
ouster-lidar#669

Summary of Changes

Replace the extern linkage with the safe function calls.

Validation

[Copilot]

Pull Request Overview

This PR fixes a double free error by replacing direct extern linkage with safe function calls that return references to static constants. This prevents potential memory management issues when the same constants are accessed from multiple translation units.

• Converts extern variable declarations to function declarations that return const references
• Changes extern variable definitions to static variables with accompanying getter functions
• Updates all usage sites to call the new getter functions instead of accessing variables directly

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
ouster_client/include/ouster/types.h	Updates header declarations from extern variables to const reference getter functions
ouster_client/src/sensor_info.cpp	Implements static variables with getter functions and updates usage sites

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