[OTS] Fix "continue-stream" handling in the woff2 decoder

(1) When reading the short form of the directory, set the
    compressed length to zero for tables with the continue-stream
    flag set.
(2) Initialize transform_buf outside the main loop since it is
    re-used for continue-streams.

Patch contributed by Zoltan Szabadka (szabadka@google.com)

R=yusukes@chromium.org

Review URL: https://codereview.chromium.org/28363002

git-svn-id: http://ots.googlecode.com/svn/trunk@104 a4e77c2c-9104-11de-800e-5b313e0d2bf3
1 file changed