Improved DSL Array error checking

Change-Id: I4b1235f7363309bd2aa3e2f1b3e00c94b43976bb
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/430058
Reviewed-by: John Stiles <johnstiles@google.com>
Commit-Queue: Ethan Nicholas <ethannicholas@google.com>
2 files changed