stringio.c: close separatedly
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@37382 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
stringio.c: close separatedly
instances, as well as IO.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@37382 b2dd03c8-39d4-4d8f-98ff-823fe69b080e