avoid uninitialized under fuzzer

https://skia-review.googlesource.com/143112
introduced new logic to handle failures;
fuzzer found a way to exploit this.

FWIW, skia's fuzzer did not call pathops when
fed the test case.

TBR=kjlubick@google.com

Bug:867314
Change-Id: Id894962d3f32e206362faff332a1330db75da175
Reviewed-on: https://skia-review.googlesource.com/143318
Reviewed-by: Cary Clark <caryclark@skia.org>
Commit-Queue: Cary Clark <caryclark@skia.org>
Auto-Submit: Cary Clark <caryclark@skia.org>
1 file changed