item_xmlfunc.cc:

  After review fix.
  Thanks to Gluh for suggestion.
  Bug#18172: XML: Extractvalue() accepts mallformed XPath without a XPath syntax error

sql/item_xmlfunc.cc

@@ -1561,13 +1561,8 @@ static int my_xpath_parse_AbsoluteLocationPath(MY_XPATH *xpath)
     return my_xpath_parse_RelativeLocationPath(xpath);
   }
 
-  if (my_xpath_parse_term(xpath, MY_XPATH_LEX_EOF))
-    return 1;
-
-  if (my_xpath_parse_RelativeLocationPath(xpath))
-    return 1;
-
-  return 0;
+  return my_xpath_parse_term(xpath, MY_XPATH_LEX_EOF) ||
+         my_xpath_parse_RelativeLocationPath(xpath);
 }