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/HTML/DOMStringMap.cpp

@@ -15,7 +15,7 @@ namespace Web::HTML {
 JS::NonnullGCPtr<DOMStringMap> DOMStringMap::create(DOM::Element& element)
 {
     auto& realm = element.realm();
-    return *realm.heap().allocate<DOMStringMap>(realm, element);
+    return realm.heap().allocate<DOMStringMap>(realm, element);
 }
 
 DOMStringMap::DOMStringMap(DOM::Element& element)