restore extra slot in sentinal array that was removed in 3825. This extra value
is read, but not acted-upon, by spanRec.init(), and so we need to have a valid
address/slot allocated.

Caught by the remoting_unittests in chrome run using ASAN.
Review URL: https://codereview.appspot.com/6176045

git-svn-id: http://skia.googlecode.com/svn/trunk@3830 2bbb7eff-a529-9590-31e7-b0007b416f81
1 file changed