Fix leak in SkSLParser

Change-Id: Id608361eadf63a02a9bde428215284201e80d4ee
Reviewed-on: https://skia-review.googlesource.com/148901
Reviewed-by: Ethan Nicholas <ethannicholas@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>
2 files changed