Fix a regression introduced in r77997.
Fix a regression introduced in r77997.

An error message would be printed at each update_depot_tools invocation.

TBR=mhm
BUG=none
TEST=running gclient shouldn't print an error message at each invocation anymore

Review URL: http://codereview.chromium.org/6690008

git-svn-id: bd64dd6fa6f3f0ed0c0666d1018379882b742947@78021 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

svn2github/chromium-depot-tools,svn2github/chromium-depot-tools,svn2github/chromium-depot-tools