Our function so far assumed that the LoaderEntries's last string is or is not NUL terminated. But if it was, then we'd debug log about this, claiming there was an invalid id. sd-boot actually ends the list in a properly NUL-terminated string, hence we should just accept that. Handle that case gracefully, and add comments explaining why we have two ways why we exit the loop. This is cosmetic only, just suppresses a misleading debug log message.
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