The immediate motivation is to allow fuzz-systemctl-parse-argv to cover also the other code paths. p_i_s_n is not getting set (and it probably shouldn't), so the fuzzer would only cover the paths for ./systemctl, and not ./reboot, etc. Looking at argv[0] instead, which is passed as part of the fuzzer data, fixes that. But I think in general it's more correct to look at argv[0] here: after all we have all the information available through local variables and shouldn't go out of our way to look at a global.
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