fix incorrect variable not assigned error in skslc

Bug: skia:
Change-Id: Id89db8acb0b14024b79b00d98d32f9c10f019537
Reviewed-on: https://skia-review.googlesource.com/18121
Reviewed-by: Chris Dalton <csmartdalton@google.com>
Commit-Queue: Ethan Nicholas <ethannicholas@google.com>
2 files changed