bpo-41204: Fix compiler warning in ast_type_init() (GH-21307)

Author: vstinner

Parser/asdl_c.py

@@ -688,13 +688,14 @@ def visitModule(self, mod):
 static int
 ast_type_init(PyObject *self, PyObject *args, PyObject *kw)
 {
-    Py_ssize_t i, numfields = 0;
-    int res = -1;
-    PyObject *key, *value, *fields;
     astmodulestate *state = get_global_ast_state();
     if (state == NULL) {
-        goto cleanup;
+        return -1;
     }
+
+    Py_ssize_t i, numfields = 0;
+    int res = -1;
+    PyObject *key, *value, *fields;
     if (_PyObject_LookupAttr((PyObject*)Py_TYPE(self), state->_fields, &fields) < 0) {
         goto cleanup;
     }