fix fuzzer found timeout

curiously, test case ran fine
with skia's fuzzer, but hung
with ubsan chrome fuzzer.

R=kjlubick@google.com

Bug:858985
Change-Id: Ie747ba9b902a25e59330a084fbdd5246d9de4920
Reviewed-on: https://skia-review.googlesource.com/138520
Reviewed-by: Cary Clark <caryclark@google.com>
Reviewed-by: Kevin Lubick <kjlubick@google.com>
Commit-Queue: Cary Clark <caryclark@google.com>
1 file changed