fix pathop fuzzer

turn assert into fail

R=kjlubick@google.com
Bug: skia:
Change-Id: I1124573959c90c7dae1a8cd54199dae429b8ca73
Reviewed-on: https://skia-review.googlesource.com/115481
Reviewed-by: Kevin Lubick <kjlubick@google.com>
Commit-Queue: Cary Clark <caryclark@skia.org>
1 file changed