[ox/model] Fix MSVC warning

(synced from b7a1236bae)

src/ox/model/descwrite.hpp

@@ -363,8 +363,8 @@ constexpr Result<DescriptorType*> buildTypeDef(TypeStore *typeStore) noexcept {
 		oxReturnError(model(&handler, t));
 		a.deallocate(t, 1);
 	} else {
-		T *t = reinterpret_cast<T*>(ox_alloca(sizeof(T)));
-		oxReturnError(model(&handler, t));
+		auto t = ox_malloca(sizeof(T), T);
+		oxReturnError(model(&handler, t.get()));
 	}
 	return writer.definition();
 }