cts: Fixed bug with conflicting error codes
cts: Fixed bug with conflicting error codes

BRANCH=None
BUG=None
TEST=Manual
- Build and run meta tests, look for listed output

Change-Id: Idd46fb92791c1d0576be95f3e4cda8cdca66daef
Reviewed-on: https://chromium-review.googlesource.com/367401
Commit-Ready: Chris Chen <94514becc10dca3cd5be30546b3f9aa2a50ec438@google.com>
Tested-by: Chris Chen <94514becc10dca3cd5be30546b3f9aa2a50ec438@google.com>
Reviewed-by: Randall Spangler <62698fdbb84d1779579ee80c3f39fac22017e5bc@chromium.org>

coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec