psych_parser.c: fix compile error
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@60919 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
psych_parser.c: fix compile error
statement, which cause compile error on mswin.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@60919 b2dd03c8-39d4-4d8f-98ff-823fe69b080e