fix mutex deadlock test hang-up.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@31458 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
fix mutex deadlock test hang-up.
mistake. (ie fix hang-up native_cond_timedwait())
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@31458 b2dd03c8-39d4-4d8f-98ff-823fe69b080e