* io.c (pipe_open): handles leaked on win32 when an error occurs.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_9_1@24120 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
merges r24090 from trunk into ruby_1_9_1.¶
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_9_1@24120 b2dd03c8-39d4-4d8f-98ff-823fe69b080e