LibJS: Convert Heap::allocate{,_without_realm}() to NonnullGCPtr

Author: https://github.com/linusg
Commit: 22089436ed
Pull-request: https://github.com/SerenityOS/serenity/pull/16498
Reviewed-by: https://github.com/trflynn89 ✅

Userland/Libraries/LibWeb/DOM/TreeWalker.cpp

@@ -36,7 +36,7 @@ JS::NonnullGCPtr<TreeWalker> TreeWalker::create(Node& root, unsigned what_to_sho
     // 1. Let walker be a new TreeWalker object.
     // 2. Set walker’s root and walker’s current to root.
     auto& realm = root.realm();
-    auto* walker = realm.heap().allocate<TreeWalker>(realm, root);
+    auto walker = realm.heap().allocate<TreeWalker>(realm, root);
 
     // 3. Set walker’s whatToShow to whatToShow.
     walker->m_what_to_show = what_to_show;
@@ -45,7 +45,7 @@ JS::NonnullGCPtr<TreeWalker> TreeWalker::create(Node& root, unsigned what_to_sho
     walker->m_filter = filter;
 
     // 5. Return walker.
-    return *walker;
+    return walker;
 }
 
 // https://dom.spec.whatwg.org/#dom-treewalker-currentnode