exit from a thread using 'break'

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@4675 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

lib/drb/drb.rb

@@ -1422,7 +1422,7 @@ module DRb
 	  ensure
 	    unless succ
 	      client.close
-	      return
+	      break
 	    end
 	  end
 	end