Remove trailing white spaces

git-svn-id: http://jp.rubyist.net/svn/rurema/bitclust/trunk@5743 018432c1-2f1c-0410-ba7c-d424024924b7
Close IO (Fix #8087)

Patched by pypypy567. Thanks!!!

git-svn-id: http://jp.rubyist.net/svn/rurema/bitclust/trunk@5744 018432c1-2f1c-0410-ba7c-d424024924b7