fix always true comparison in assert

Bug: skia:10632
Change-Id: I271875a73b7e80a3ef5ea357eab7c8165440e7a9
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/327718
Auto-Submit: Brian Salomon <bsalomon@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>
Commit-Queue: Robert Phillips <robertphillips@google.com>
Reviewed-by: Robert Phillips <robertphillips@google.com>
1 file changed