pceplib: ignore NULL obj in free_obj api

[mjstapp]

Safely ignore a NULL obj pointer passed to the free_obj api.

[greptile-apps]

Greptile Summary

This PR adds a defensive NULL check at the top of pcep_obj_free_object() in pceplib/pcep_msg_tools.c, so that callers passing a NULL pointer will get a safe no-op instead of a crash. The change is minimal and correct.

Confidence Score: 5/5

Safe to merge — a minimal, correct NULL guard with no side effects.

The change is a single, well-understood defensive check. It cannot introduce regressions, and all existing call sites that pass non-NULL objects are unaffected.

No files require special attention.

Vulnerabilities

No security concerns identified.

Important Files Changed

Filename	Overview
pceplib/pcep_msg_tools.c	Adds a NULL guard at the top of pcep_obj_free_object() to safely return early when a NULL pointer is passed, preventing potential NULL-dereference crashes.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A([pcep_obj_free_object called]) --> B{obj == NULL?}
    B -- Yes --> C([return early, no-op])
    B -- No --> D{obj->tlv_list != NULL?}
    D -- Yes --> E[Iterate TLVs\npcep_obj_free_tlv each]
    E --> F[dll_destroy tlv_list]
    F --> G[switch on object_class\nfree specific object data]
    D -- No --> G
    G --> H[pceplib_free obj]
    H --> I([done])

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