Coverity issues for week 25: Coverity thinks some HS tests have memory leaks
The `hs_free_all()` function should free the `hs_service_t` instances in our tests, but it seems like Coverity doesn't detect this and claims that a memory leak might happen. Relevant CID's: 1437457, 1437455, 1437452, 1437446, 1437443, 1437435, 1437432, 1437430, 1437428, and 1437426. CID: 1437442 is related to this issue (I think)
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