issue: 4457054 Fix segfault at exit if initialization fails

[pasis]

Description

In free_libxlio_resources(), we try to print report for g_p_net_device_table_mgr, however, it can be NULL if XLIO initialization fails. Check the pointer to avoid NULL pointer dereference.

What

Segfault fix.

Why ?

Segfault fix.

Change type

What kind of change does this PR introduce?

• [x] Bugfix
• [ ] Feature
• [ ] Code style update
• [ ] Refactoring (no functional changes, no api changes)
• [ ] Build related changes
• [ ] CI related changes
• [ ] Documentation content changes
• [ ] Tests
• [ ] Other

Check list

• [ ] Code follows the style de facto guidelines of this project
• [ ] Comments have been inserted in hard to understand places
• [ ] Documentation has been updated (if necessary)
• [ ] Test has been added (if possible)