Don't do PolyUtil fuzz tests on invalid polygons.

We shouldn't be trying to run the convex routine on known non-convex
polygons, and the offset routine only works for simple polygons.

Bug: oss-fuzz:43588
Change-Id: Ia1c73d05d7b1496c9d0599ee36eafe1d58684fd6
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/494818
Reviewed-by: Michael Ludwig <michaelludwig@google.com>
Commit-Queue: Jim Van Verth <jvanverth@google.com>
1 file changed