Fix subtract with overflow in readsymmetricpattern#84

hschimke merged 2 commits intorxing-core:mainrxing-core/rxing:mainfrom

forzafedor:fix-subtract-with-overflow-in-readsymmetricpatternforzafedor/rxing:fix-subtract-with-overflow-in-readsymmetricpatternCopy head branch name to clipboard