Update lib/rexml/functions.rb

Co-authored-by: NAITOH Jun <naitoh@gmail.com>

Author: tompng

lib/rexml/functions.rb

@@ -79,9 +79,9 @@ def target_named_node(node_set = nil)
       node =
         case node_set
         when nil
-          node = @context[:node]
+          @context[:node]
         when Array
-          node = XPathParser.sort(node_set).first
+          XPathParser.sort(node_set).first
         end
       node if node.respond_to?(:namespace)
     end