fix pathops fuzz

this fixes the SkOpSegment.cpp fuzz break.

R=kjlubick@google.com

Bug: skia:
Change-Id: Ia22a7b3066592969257f10ff7b593f3caecbf988
Reviewed-on: https://skia-review.googlesource.com/c/170840
Auto-Submit: Cary Clark <caryclark@skia.org>
Reviewed-by: Kevin Lubick <kjlubick@google.com>
Commit-Queue: Kevin Lubick <kjlubick@google.com>
1 file changed