The check was inverted, and was generating suprious error messages.

Bug: None
Change-Id: I139bb9e7d15e51fbec8c5703b26ed60e1ed1fab8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/3884910
Commit-Queue: Jamie Madill <jmadill@chromium.org>
Commit-Queue: Josip Sokcevic <sokcevic@google.com>
Auto-Submit: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Josip Sokcevic <sokcevic@google.com>