[sr-dev] [kamailio/kamailio] Fix or silence warnings given by Clang (#637)

[Daniel-Constantin Mierla]

For the commit 94b4c25, is it handling properly the value 0?

Not dug much into the code, so this is more like a safety check to see that the return code or the parameter was not supposed to be negative in case of error or missing expires header.

Given those patches are related to ims modules, maybe @jaybeepee, @richardgood or @ngvoice may want to take a look.

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