Cleaup makeOp

Change-Id: Ia9d805e7b7292585b6387a0f1c76abc791b9458d
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/292569
Reviewed-by: Robert Phillips <robertphillips@google.com>
Commit-Queue: Herb Derby <herb@google.com>
2 files changed