Fix SkRRect validation for negative types

SkRRect::fType is an int, so needs to be checked to see if it's
negative.

Bug: chromium: 768149
Change-Id: I6a9a019c736806d35dc1bd627fb4ddc735a0ac86
Reviewed-on: https://skia-review.googlesource.com/54024
Commit-Queue: Mike Reed <reed@google.com>
Reviewed-by: Mike Reed <reed@google.com>
1 file changed