fixed an SkSL parse issue

Change-Id: Icc44b10184c7be564fe7d759075a9c87c53af712
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/242141
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Ethan Nicholas <ethannicholas@google.com>
2 files changed