Fix leak in GM:Rectanizer

TBR=

Change-Id: I0e6135ac7fac433a0539f00a45f569ce4f48aa7c
Reviewed-on: https://skia-review.googlesource.com/89421
Reviewed-by: Florin Malita <fmalita@chromium.org>
Commit-Queue: Florin Malita <fmalita@chromium.org>
1 file changed