Fix broken behaviour in previous commit. Oops.

components/susignup-admin.php

@@ -307,7 +307,7 @@ function su_response_decode($text) {
 	if (!$xml || isset($xml->head->title)) {
 		return false;
 	} else {
-		return json_decode($x[0],TRUE);
+		return json_decode($xml[0],TRUE);
 	}
 }