FuzzCanvas: fix BUG=skia:6321

Change-Id: I979b85cbe1eadca667d5d622bbbe24749da7b770
Reviewed-on: https://skia-review.googlesource.com/9289
Commit-Queue: Hal Canary <halcanary@google.com>
Reviewed-by: Kevin Lubick <kjlubick@google.com>
1 file changed