Init fDevKLMMatrix in GrGLCubicEffect (possible valgrind fix)

TBR=bsalomon@google.com

Change-Id: I97357291d6d4098caecc9ac37348c9b9436ce11b
Reviewed-on: https://skia-review.googlesource.com/19442
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Robert Phillips <robertphillips@google.com>
1 file changed