Fix double close in ARGF#read_nonblock spec
Fix double close in ARGF#read_nonblock spec

ruby/spec,ruby/spec,ruby/spec,kachick/rubyspec,eregon/rubyspec,nobu/rubyspec,sgarciac/spec,ruby/rubyspec,sgarciac/spec,kachick/rubyspec,kachick/rubyspec,eregon/rubyspec,nobu/rubyspec,eregon/rubyspec,ruby/rubyspec,nobu/rubyspec,sgarciac/spec