diff --git a/core/modules/node/src/NodeForm.php b/core/modules/node/src/NodeForm.php
index 37bb7da..30aca18 100644
--- a/core/modules/node/src/NodeForm.php
+++ b/core/modules/node/src/NodeForm.php
@@ -309,7 +309,7 @@ public function validate(array $form, array &$form_state) {
     }
 
     // Validate the "authored by" field.
-    if (!empty($form_state['values']['uid']) && !($account = user_load_by_name($form_state['values']['uid']))) {
+    if (!empty($form_state['values']['uid']) && !user_load_by_name($form_state['values']['uid'])) {
       // The use of empty() is mandatory in the context of usernames
       // as the empty string denotes the anonymous user. In case we
       // are dealing with an anonymous user we set the user ID to 0.
diff --git a/core/modules/node/src/Tests/NodeSaveTest.php b/core/modules/node/src/Tests/NodeSaveTest.php
index 5164ecf..0377705 100644
--- a/core/modules/node/src/Tests/NodeSaveTest.php
+++ b/core/modules/node/src/Tests/NodeSaveTest.php
@@ -90,7 +90,6 @@ function testTimestamps() {
 
     // Store the timestamps.
     $created = $node->getCreatedTime();
-    $changed = $node->getChangedTime();
 
     $node->save();
     $node = $this->drupalGetNodeByTitle($edit['title'], TRUE);
diff --git a/core/modules/node/src/Tests/NodeTypePersistenceTest.php b/core/modules/node/src/Tests/NodeTypePersistenceTest.php
index 66ea769..1dd4c96 100644
--- a/core/modules/node/src/Tests/NodeTypePersistenceTest.php
+++ b/core/modules/node/src/Tests/NodeTypePersistenceTest.php
@@ -29,7 +29,6 @@ function testNodeTypeCustomizationPersistence() {
     $this->drupalLogin($web_user);
     $forum_key = 'modules[Core][forum][enable]';
     $forum_enable = array($forum_key => "1");
-    $forum_disable = array($forum_key => FALSE);
 
     // Enable forum and verify that the node type exists and is not disabled.
     $this->drupalPostForm('admin/modules', $forum_enable, t('Save configuration'));