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#### Type Of Change
- [x] Small bug fix (non-breaking change which fixes an issue)
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- [ ] Breaking change (fix or feature that would change existing functionality)

#### Checklist:
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- [ ] PR should be backported to stable branches
- [x] Tested changes locally
- [x] Related to issue #3814

#### Description
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When the fixup is done in main using fix_rls function (fixing the route lists 
in cfg file), all the children inherit the memory allocated as a copy that 
needs separate management. 

The function responsible for the fixup (fix_actions) is also used to call the 
free_fixup function with an added argument. 

Then on main, we call the free_rls ( as fix_rls) on two separate occasions. 
Once in cleanup() function for the main process and once in the sig_usr() 
function for each of the children.

This seems to work fine and after debugging with `file_out` fixups, I can no 
longer see memory leaks due to the malloced memory in one of the fixups.

- main.c: Call free_rls() in cleanup() function to clean route lists and fixed 
up parameters in main process.

- main.c: Call free_rls() in sig_usr() function to clean route lists and fixed 
up parameters in child processes.

My question is, after a parameter is fixed, is it saved somewhere else, 
therefore we can immediately free the fix-up resources and not on shutdown?

You can view, comment on, or merge this pull request online at:

  https://github.com/kamailio/kamailio/pull/4023

-- Commit Summary --

  * core: Add fix_actions function parameter in fix_actions to free fixed up 
resources

-- File Changes --

    M src/core/route.c (61)
    M src/core/route.h (3)
    M src/core/rvalue.c (2)
    M src/core/switch.c (4)
    M src/main.c (4)

-- Patch Links --

https://github.com/kamailio/kamailio/pull/4023.patch
https://github.com/kamailio/kamailio/pull/4023.diff

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