don't create out of range enums

UBSAN freaks out.

Bug: oss-fuzz:19358
Change-Id: I7c5fc129042b8b30fb5f10fe56b97cf62877c9bf
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/259537
Commit-Queue: Mike Klein <mtklein@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>
Auto-Submit: Mike Klein <mtklein@google.com>
Reviewed-by: Brian Salomon <bsalomon@google.com>
1 file changed