Fix int/uint comparison in TextureOp asserts

Bug: skia:9705
Change-Id: I288bd125739cfe3dc38d8a8150a11a1c0115103a
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/261079
Commit-Queue: Michael Ludwig <michaelludwig@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
1 file changed