SkFontStyleSet_DirectWrite::getStyle to properly handle NULL out params.

R=reed@google.com

Review URL: https://codereview.chromium.org/201213003

git-svn-id: http://skia.googlecode.com/svn/trunk@13829 2bbb7eff-a529-9590-31e7-b0007b416f81
1 file changed