This prevents unnecessary user interactions when `fido2-device` is set to something other than `auto` -- a case overlooked in the original PR #23577 (and later #25268). We do not move pre-flight checks to `fido2_use_hmac_hash_specific_token` because the behaviors are different between different cases: when the device path is NULL, we try to automatically choose the correct device, in which case pre-flight errors should be "soft" errors, without spamming the tty with error outputs; but when a specific device path is given, a pre-flight request that determined the non-existence of the credential should be treated the same as a failed assertion request.
System and Service Manager
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