fix divides for osfuzz

R=kjlubick@google.com

Bug: oss-fuzz:10567,oss-fuzz:10568
Change-Id: I22bf654e183a973f2c50ea619aaaba1c22f44912
Reviewed-on: https://skia-review.googlesource.com/c/162580
Commit-Queue: Cary Clark <caryclark@google.com>
Reviewed-by: Kevin Lubick <kjlubick@google.com>
2 files changed