check for non-finite values in point3 case

Bug: oss-fuzz:20581
Bug: 1050296
Change-Id: I3059bc95fc9f54d1cb2f228101065b03167762a0
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/270636
Reviewed-by: Kevin Lubick <kjlubick@google.com>
Commit-Queue: Mike Reed <reed@google.com>
1 file changed