GCC 4.6 fix: intptr_t <-> NULL triggers an warning.

BUG=chromium:87001
TEST=none

Patch by Ryan Sleevi <rsleevi@chromium.org>
Review URL: http://codereview.appspot.com/4571048/

git-svn-id: http://skia.googlecode.com/svn/trunk@1538 2bbb7eff-a529-9590-31e7-b0007b416f81
3 files changed