Don't need to free the null head, and skip trying to assemble labels on second pass
Don't need to free the null head, and skip trying to assemble labels on second pass

git-svn-id: 78cc2a864430e58e1a02096a179e3ea8e4996a78@821 96dfbd92-d197-e211-9ca9-00110a534b34

RyuKojiro/v6502