io.c (io_fflush): eliminate redundant rb_io_check_closed
There is no need to call this function twice in a row since thread switching won't happen in-between calls to it. git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@66244 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
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