[logdog/client] Fix polarity of logging message.
[logdog/client] Fix polarity of logging message.

This was only meant to check the error on windows (as per the comment
directly above it).

TBR=tandrii@chromium.org

Bug: 910369
Change-Id: I9c8e3c71e666b14836c3189816ec889503868364
Reviewed-on: https://chromium-review.googlesource.com/c/infra/luci/luci-go/+/1839834
Reviewed-by: Robbie Iannucci <40f3d43a28ebae3cb819288542e1c84d73d962d5@chromium.org>
Commit-Queue: Robbie Iannucci <40f3d43a28ebae3cb819288542e1c84d73d962d5@chromium.org>

luci/luci-go,luci/luci-go,luci/luci-go,luci/luci-go,luci/luci-go,luci/luci-go