Remove unused variable to fix warning on Windows:
  src\core\SkBlitter_ARGB32.cpp(362) : warning C4101: 'alpha32' : unreferenced local variable


git-svn-id: http://skia.googlecode.com/svn/trunk@278 2bbb7eff-a529-9590-31e7-b0007b416f81
1 file changed