fix rawiter::peek

Bug: skia:
Change-Id: I27f1b788c0e89da41479e9ef379f5a8feb02ea8e
Reviewed-on: https://skia-review.googlesource.com/c/192028
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Mike Reed <reed@google.com>
1 file changed