[sr-dev] [kamailio/kamailio] topoh: PKG memory leak (#2027)

[Whitey]

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### Description

I've noticed PKG memory increasing since enabling the topoh module last week in a significant manner (~7MB per worker over 3000 calls split between 4 workers). Removing the topoh module removed the memory usage.

Here is a pkg dump of one of the process post 3000 calls:

https://paste.ubuntu.com/p/85KYg7gD2z/

### Additional Information

```kamailio 5.3.0-dev4 (x86_64/linux) 6d43ea-dirty. ```

I'm unsure why it's tagged dirty, as I simply cloned master and reset to 6d43eacd6d5b78fe857267e70b7fa85519a7d5b6.

I do plan to test this on dev7, however an unrelated issue is preventing me from testing this with my app_ruby based code.


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