fsanitize emits memory leaks errors about clove-unit

[fdefelici]

I made some verification and the memory leak is not due to the foreach macro itself, but it's from the "polymorophic" function call __clove_cmdline_errno_t result = (*handler)(&cmdline);

There are some vectors stored in map that that are not properly freed. Now, I remember that I did it on purpose to avoid to make complex memory management in that case (considering the fact we are in a test library and leaks are negligible related to data related to library itself and that data are just stored once and then freed at the end of test execution)

Anyhow, this could be improved