typo and cleanup debug output

index.php

@@ -48,11 +48,6 @@ if (isset($_GET['secret']) && $_GET['secret'] === REGISTRATION_PASSWORD) {
     ];
     $content['mac'] = hash_hmac('sha1', $content['nonce']."\0".$content['username']."\0".$content['password']."\0".'notadmin', REGISTRATION_SHARED_SECRET);
 
-    # debug
-    echo '<!--';
-    var_dump($content);
-    echo '-->';
-
     $ch = curl_init();
     curl_setopt($ch, CURLOPT_URL, SYNAPSE_URL.'/_synapse/admin/v1/register');
     curl_setopt($ch, CURLOPT_POST, true);
@@ -63,13 +58,13 @@ if (isset($_GET['secret']) && $_GET['secret'] === REGISTRATION_PASSWORD) {
     curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
     $response = curl_exec($ch);
     if (curl_error($ch) || curl_getinfo($ch, CURLINFO_HTTP_CODE) !== 200) {
-        $decoded_response = json_decode($response);
 ?>
 
 Registration for "<?php echo $username ?>" unsuccessful. Please try again later.
 
 <?php
     } else {
+        $decoded_response = json_decode($response);
 ?>
 
 Registration successful. To start using it please install a Matrix client like <a href="https://element.io/download">Element</a><br>
@@ -85,7 +80,6 @@ Also consider using a password manager.<br>
 <br>
 
 <?php
-        echo var_dump($decoded_response);
 
         # logout out of session that exists after registering
         $ch = curl_init();