Fix: Remove duplicate uasync_destroy call in test_pkt_normalizer_standalone

tests/test_pkt_normalizer_standalone.c

@@ -309,12 +309,6 @@ int main() {
     printf("\nCleaning up...\n");
     cleanup();
 
-    // Destroy uasync instance after cleanup
-    if (mock_instance.ua) {
-        uasync_destroy(mock_instance.ua, 0);
-        mock_instance.ua = NULL;
-    }
-
     if (test_completed == 1) {
         printf("\n=== TEST PASSED ===\n");
         return 0;