fix leaks in SkConf

These leaks were small and would only happen with non-default
runtime configuration things set, but they were still leaks
and they should be squished.

Valgrind reported leaks pre-patch, and all the rtconf leaks are gone after patch.

BUG=skia:1722
R=reed@google.com

Author: humper@google.com

Review URL: https://codereview.chromium.org/136963004

git-svn-id: http://skia.googlecode.com/svn/trunk@13269 2bbb7eff-a529-9590-31e7-b0007b416f81
2 files changed