[skif] Fix origin negation
[skif] Fix origin negation

Bug: oss-fuzz:53342
Change-Id: Ib07e0e1af5df185b044afb62584ab10eabc862b5
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/604876
Reviewed-by: Robert Phillips <95e8ac5504948c7bf91b22c16a8dbb7ae7c66bfd@google.com>
Commit-Queue: Michael Ludwig <cb1f3dd24de0f0b611b26bc28bec758a551d9b7d@google.com>
Auto-Submit: Michael Ludwig <cb1f3dd24de0f0b611b26bc28bec758a551d9b7d@google.com>

google/skia,google/skia,google/skia,google/skia,google/skia,google/skia,google/skia,google/skia,google/skia,google/skia