fixed 0 - x in skslc

Bug: skia:
Change-Id: Ib9bd6bdd8f339e5395157532f68bb12f5ccb4a02
Reviewed-on: https://skia-review.googlesource.com/14030
Reviewed-by: Ben Wagner <benjaminwagner@google.com>
Commit-Queue: Ethan Nicholas <ethannicholas@google.com>
1 file changed