topoh: memory leak fix for API call

[toharish]

th_mask_callid_str & th_unmask_callid_str functions used for API call to encode/decode call-ID uses static array declaration for callid_mbuf was unable to free callid data lump after use and leads to memory leak. when these functions was used through API call for topos module memory leak bug as reported
qm_free(): BUG: bad pointer 0x7faec4a7xxxx (out of memory block!) called from core: core/data_lump.c: free_lump(470)

This two funtions are not used other than API.

Pre-Submission Checklist

• Commit message has the format required by CONTRIBUTING guide
• Commits are split per component (core, individual modules, libs, utils, ...)
• Each component has a single commit (if not, squash them into one commit)
• No commits to README files for modules (changes must be done to docbook files
  in doc/ subfolder, the README file is autogenerated)

Type Of Change

• Small bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds new functionality)
• Breaking change (fix or feature that would change existing functionality)

Checklist:

• PR should be backported to stable branches
• Tested changes locally
• Related to issue #XXXX (replace XXXX with an open issue number)

Description