blake2module.c does not handle errors on module creation

[sobolevn]

Bug report

It does it in some parts:

• cpython/Modules/_blake2/blake2module.c

  Lines 88 to 90 in 81eba76

  	if (PyModule_AddType(m, st->blake2b_type) < 0) {
  	return -1;
  	}

• cpython/Modules/_blake2/blake2module.c

  Lines 66 to 75 in 81eba76

  	#define ADD_INT(d, name, value) do { \
  	PyObject *x = PyLong_FromLong(value); \
  	if (!x) \
  	return -1; \
  	if (PyDict_SetItemString(d, name, x) < 0) { \
  	Py_DECREF(x); \
  	return -1; \
  	} \
  	Py_DECREF(x); \
  	} while(0)

But, not in others:

• cpython/Modules/_blake2/blake2module.c

  Lines 98 to 101 in 81eba76

  	PyModule_AddIntConstant(m, "BLAKE2B_SALT_SIZE", BLAKE2B_SALTBYTES);
  	PyModule_AddIntConstant(m, "BLAKE2B_PERSON_SIZE", BLAKE2B_PERSONALBYTES);
  	PyModule_AddIntConstant(m, "BLAKE2B_MAX_KEY_SIZE", BLAKE2B_KEYBYTES);
  	PyModule_AddIntConstant(m, "BLAKE2B_MAX_DIGEST_SIZE", BLAKE2B_OUTBYTES);

• cpython/Modules/_blake2/blake2module.c

  Lines 120 to 123 in 81eba76

  	PyModule_AddIntConstant(m, "BLAKE2S_SALT_SIZE", BLAKE2S_SALTBYTES);
  	PyModule_AddIntConstant(m, "BLAKE2S_PERSON_SIZE", BLAKE2S_PERSONALBYTES);
  	PyModule_AddIntConstant(m, "BLAKE2S_MAX_KEY_SIZE", BLAKE2S_KEYBYTES);
  	PyModule_AddIntConstant(m, "BLAKE2S_MAX_DIGEST_SIZE", BLAKE2S_OUTBYTES);

This is similar to:

• _selectmodule.c does not handle errors when creating a module #111233
• _ssl.c does not handle errors on module creation #111230

Linked PRs

• gh-111251: Fix blake2module.c not checking for errors when initializing #111252
• [3.12] gh-111251: Fix error checking in _blake2 module init (GH-111252) #111297
• [3.11] gh-111251: Fix error checking in _blake2 module init (GH-111252) #111298

[hugovk]

Backport PRs now merged, thanks!