libweave: Don't check error messages in unittests

Error code checks should be enough.

BUG=none
TEST='FEATURES=test emerge-gizmo buffet'

Change-Id: I8c9ec8cd1c368bc46f247162e7a77be6e1f869fa
Reviewed-on: https://chromium-review.googlesource.com/289642
Trybot-Ready: Vitaly Buka <vitalybuka@chromium.org>
Tested-by: Vitaly Buka <vitalybuka@chromium.org>
Reviewed-by: Alex Vakulenko <avakulenko@chromium.org>
Commit-Queue: Vitaly Buka <vitalybuka@chromium.org>
7 files changed
tree: fe7202bfa68d11146fcae732bbeb6bf3b7d7336a
  1. buffet/
  2. libweave/