CrOS: Fix tryserver scheduling bug.
CrOS: Fix tryserver scheduling bug.

Fix a tryserver scheduling bug due to a misnamed (and misspelled, lol)
variable. Also add better error reporting.

BUG=chromium:556694
TEST=local
  - Ran local tryserver, observed not scheduling.
  - Applied fix, observed scheduling.

R=davidjames@chromium.org, martiniss@chromium.org

Review URL: https://codereview.chromium.org/1445263002

git-svn-id: 239fca9b83025a0b6f823aeeca02ba5be3d9fd76@297570 0039d316-1c4b-4281-b951-d872f2087c98

eunchong/build,eunchong/build,eunchong/build,eunchong/build