io.c: fix race between read and close
* io.c (io_fillbuf): fix race between read and close and bail out in the case the IO gets closed before the reading thread achieve the lock. [ruby-core:78845] [Bug #13076] git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@57224 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
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