Let's always derive credentials from a bus name or a conneciton fd if we can, because they pin things. Let's not go via PID really, because it's always racy to do so. Note that this doesn't change much, since we wouldn't use such augmented data for auth anyway (because it will be masked in the sd_bus_creds.augmented mask as untrusted). But still, let's prefer trusted data over untrusted data.
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