Fix a spurious MSVC compiler warning

Bug: skia:
Change-Id: I31b8c2e7d847ce11d89f5484cbd32c122d3baa6a
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/213021
Commit-Queue: Chris Dalton <csmartdalton@google.com>
Commit-Queue: Robert Phillips <robertphillips@google.com>
Reviewed-by: Robert Phillips <robertphillips@google.com>
1 file changed