* lib/irb/ext/save-history.rb: identify rightly a status of a
	  history file that already exists [Bug #7694]. Thanks Nobuhiro IMAI
	  for this patch.



git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@38834 b2dd03c8-39d4-4d8f-98ff-823fe69b080e