Fix a leak in _PyImport_LoadDynamicModuleWithSpec() after failing PySys_Audit() (GH-28862)

(cherry picked from commit 9883ca498d654a4792d530bd8d6d64fef4dc971c)

Co-authored-by: Serhiy Storchaka <storchaka@gmail.com>
diff --git a/Python/importdl.c b/Python/importdl.c
index 1847eba..27ffc64 100644
--- a/Python/importdl.c
+++ b/Python/importdl.c
@@ -121,7 +121,7 @@ _PyImport_LoadDynamicModuleWithSpec(PyObject *spec, FILE *fp)
 
     if (PySys_Audit("import", "OOOOO", name_unicode, path,
                     Py_None, Py_None, Py_None) < 0) {
-        return NULL;
+        goto error;
     }
 
 #ifdef MS_WINDOWS