8b21bbd6f0
PCR extensions are supposed to be useful for "destroying" the ability to access TPM bound secrets. Hence, if for some reason we fail to extend a PCR, it's safer to just reboot, instead of going on without the extension, leaving secrets potentially accessible which should not be accessible. Note that the services exit gracefully if no TPM is found, hence this should not be triggered on TPM-less systems. However, this enforces that if there is a TPM that is accessible to Linux and that works properly, the PCR measurement must complete too. Inspired by this thread: https://lists.freedesktop.org/archives/systemd-devel/2025-March/051244.html
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