Issue #2080421 by mrsinguyen: Remove Unused local variable from...

Issue #2080421 by mrsinguyen: Remove Unused local variable  from /core/modules/book/lib/Drupal/book/Tests/BookTest.php.

core/modules/book/lib/Drupal/book/Tests/BookTest.php

@@ -487,7 +487,7 @@ function testBookNodeTypeChange() {
    */
   public function testBookOrdering() {
     // Create new book.
-    $nodes = $this->createBook();
+    $this->createBook();
     $book = $this->book;
 
     $this->drupalLogin($this->admin_user);