fix crasher in path-->region

Bug: skia:7491
Change-Id: I7e8b9fbe43098094d5935331107c3f40fb6971ec
Reviewed-on: https://skia-review.googlesource.com/110721
Commit-Queue: Mike Reed <reed@google.com>
Reviewed-by: Cary Clark <caryclark@google.com>
Reviewed-by: Yuqian Li <liyuqian@google.com>
5 files changed