Fix formatting error in test output

BUG=skia:

Change-Id: I36824a4a3fcae3a75157706b769047a82cb3c289
Reviewed-on: https://skia-review.googlesource.com/9728
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
1 file changed