[sr-dev] [kamailio/kamailio] Free database column name as part of database result cleanup (#611)

[William King]

@miconda Makes sense. No need to malloc/free if it isn't absolutely required for a commonly used code path. I'll look over the patch and see if I can see a better approach(using flags to signify malloced pointer). One of the larger concerns here was that clang's address sanitizer was pointing out that at least one of the cases there was a pointer to stack memory being returned, which could lead to bad things as that stack frame was used by another thread.

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