component_manager: fix uint comparison in unittest Change-Id: I4fcaf6685cac5ecd001a034449c28a6c024de4c3 Reviewed-on: https://weave-review.googlesource.com/1890 Reviewed-by: Vitaly Buka <vitalybuka@google.com> Reviewed-by: Alex Vakulenko <avakulenko@google.com>