Bob Beck e06f172bf2 Fix use of unitialized cbb on failure case.
This made fido2's fuzzer angry: https://buganizer.corp.google.com/issues/271220905

Change-Id: Ib1b909be10f230df2daea3942f35cba0a81dcedb
Reviewed-on: https://boringssl-review.googlesource.com/c/boringssl/+/57765
Commit-Queue: Bob Beck <bbe@google.com>
Commit-Queue: David Benjamin <davidben@google.com>
Auto-Submit: Bob Beck <bbe@google.com>
Reviewed-by: David Benjamin <davidben@google.com>
2023-03-02 17:10:21 +00:00
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