[sr-dev] [kamailio/kamailio] ndb_redis: Fix leaks from PV parsing (#2536)

[Daniel-Constantin Mierla]

Then just reuse the redis result (reply) ids (e.g., static strings), likely you do not need to work with more than 2-3 results at the same time.

The design of PVs, which was done for the native scripting language, has impact here -- in the native scripting the PV names are resolved at startup, but with Kem, PVs can be created dynamically and can result in filling the memory. It is not a leak per se, because they are still referenced.

A similar case was also reported with sqlops module in #2032, in case you want to read about.

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