[ox/std] Fix possible false positive in HashMap::operator==

deps/ox/src/ox/std/hashmap.hpp

@@ -109,7 +109,9 @@ constexpr bool HashMap<K, T>::operator==(HashMap const &other) const {
 	for (auto &k : m_keys) {
 		auto const a = at(k).value;
 		auto const b = other.at(k).value;
-		if (a && b && *a != *b) {
+		if (
+			a != b && // handle one being null and other not
+			(a && b && *a != *b)) {
 			return false;
 		}
 	}