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f3f2f72f96
(*LocalBackend).setControlClientLocked() is called to both set and reset b.cc. We shouldn't attempt to start the audit logger when b.cc is being reset (i.e., cc is nil). However, it's fine to start the audit logger if b.cc implements auditlog.Transport, even if it's not a controlclient.Auto but a mock control client. In this PR, we fix both issues and add an assertion that controlclient.Auto is an auditlog.Transport. This ensures a compile-time failure if controlclient.Auto ever stops being a valid transport due to future interface or implementation changes. Updates tailscale/corp#26435 Signed-off-by: Nick Khyl <nickk@tailscale.com>