c63bfd0884
Otherwise under certain conditions `va_arg()` might get garbage instead
of the expected value, i.e.:
$ sudo build-o0/systemctl disable asdfasfaf
sd_bus_message_appendv: Got uint64_t: 0
Failed to disable unit: Unit file asdfasfaf.service does not exist.
$ sudo build-o1/systemctl disable asdfasfaf
sd_bus_message_appendv: Got uint64_t: 7954875719681572864
Failed to disable unit: Invalid argument
(reproduced on an armv7hl machine)
Resolves: #26568
Follow-up to: bf1bea43f1
Related issue: https://github.com/systemd/systemd/pull/14470#discussion_r362893735
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