Issue #2080709 by chertzog, mikemiles86: Remove unused local variables from the XMLRPC module.

core/modules/xmlrpc/xmlrpc.server.inc

@@ -215,7 +215,8 @@ function xmlrpc_server_call($xmlrpc_server, $methodname, $args) {
   // If the method has a signature, validate the request against the signature
   if (is_array($signature)) {
     $ok = TRUE;
-    $return_type = array_shift($signature);
+    // Remove first element of $signature which is the unused 'return type'.
+    array_shift($signature);
     // Check the number of arguments
     if (count($args) != count($signature)) {
       return xmlrpc_error(-32602, t('Server error. Wrong number of method parameters.'));