core: don't use static buffer for nm_utils_ip4_property_path()
and nm_utils_ip6_property_path(). The API with static buffers looks a bit nicer. But I think they are dangerous, because we tend to pass the buffer down several layers of the stack, and it's not immediately clear, that we don't overwrite the static buffer again (which we probably did not, but it's hard to verify that there is no bug there).
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