a91078bc57
Commit1b86c7c59e("virt: make virtualization enum a named type") made the conversion from `if (!r)` to `if (v != VIRTUALIZATION_NONE)`. However, the initial test was meaning "if r is null", IOW "if r IS `VIRTUALIZATION_NONE`). The test is wrong and this can lead to false detection of the container environment (when calling `systemctl exit`). For example, https://gitlab.freedesktop.org/whot/libevdev/-/jobs/34207974 is calling `systemctl exit 0`, and systemd terminates with the exit code `130`. Fixing that typo makes `systemctl exit 0` returns `0`. Fixes:1b86c7c59e.
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