bookmaker fix Build-Debian9-GCC-x86_64 Debug

removed meaningless compare
TBR=caryclark@google.com

Bug: skia:
Change-Id: Id4ce81a71d03deaa528b5470c5e4336ca649629e
Reviewed-on: https://skia-review.googlesource.com/c/160561
Reviewed-by: Cary Clark <caryclark@skia.org>
Commit-Queue: Cary Clark <caryclark@skia.org>
Auto-Submit: Cary Clark <caryclark@skia.org>
1 file changed