rexml: Fix a XPath bug of function()/path

[Bug #14600]
    
* lib/rexml/functions.rb: Fix a bug that "function()/path" always returns
  nothing.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@63086 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

lib/rexml/parsers/xpathparser.rb

@@ -515,7 +515,9 @@ module REXML
         rest = FilterExpr( path, n )
         if rest != path
           if rest and rest[0] == ?/
-            return RelativeLocationPath(rest, n)
+            rest = RelativeLocationPath(rest, n)
+            parsed.concat(n)
+            return rest
           end
         end
         rest = LocationPath(rest, n) if rest =~ /\A[\/\.\@\[\w*]/