Fix fuzzer alert
Fix fuzzer alert

BUG=skia:

Review URL: https://codereview.chromium.org/1755323002

google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot