Issue #18520: Add a new PyStructSequence_InitType2() function, same than
PyStructSequence_InitType() except that it has a return value (0 on success,
-1 on error).

 * PyStructSequence_InitType2() now raises MemoryError on memory allocation failure
 * Fix also some calls to PyDict_SetItemString(): handle error
diff --git a/Modules/pwdmodule.c b/Modules/pwdmodule.c
index d4ef733..9909400 100644
--- a/Modules/pwdmodule.c
+++ b/Modules/pwdmodule.c
@@ -216,8 +216,9 @@
         return NULL;
 
     if (!initialized) {
-        PyStructSequence_InitType(&StructPwdType,
-                                  &struct_pwd_type_desc);
+        if (PyStructSequence_InitType2(&StructPwdType,
+                                       &struct_pwd_type_desc) < 0)
+            return NULL;
         initialized = 1;
     }
     Py_INCREF((PyObject *) &StructPwdType);