Fix max/min error

BUG=skia:

Change-Id: I6a690e843476e31077a90a8312f6335d8ef230f4
Reviewed-on: https://skia-review.googlesource.com/5544
Reviewed-by: Matt Sarett <msarett@google.com>
Commit-Queue: Matt Sarett <msarett@google.com>
1 file changed