Properly initialize sb_full so windows debug builds work.

sb_full = sb_full throws an error on windows since sb_full hasn't
been defined.

Change-Id: I69b3308b2d84eaa8cb64b73d435dae3e615247d6
Merge topic 'oggtheora_unitialized_var' into master

cc52b52d Properly initialize sb_full so windows debug builds work.