`socketmodule.c` does not handle errors on module creation extension-modules

[sobolevn]

Bug report

It handles most with a specialized macro:

cpython/Modules/socketmodule.c

Lines 7716 to 7722 in 81eba76

	/* Kernel event messages */
	#ifdef PF_SYSTEM
	ADD_INT_MACRO(m, PF_SYSTEM);
	#endif
	#ifdef AF_SYSTEM
	ADD_INT_MACRO(m, AF_SYSTEM);
	#endif

but not these ones:

cpython/Modules/socketmodule.c

Lines 7724 to 7731 in 81eba76

	/* FreeBSD divert(4) */
	#ifdef PF_DIVERT
	PyModule_AddIntMacro(m, PF_DIVERT);
	#endif
	#ifdef AF_DIVERT
	PyModule_AddIntMacro(m, AF_DIVERT);
	#endif

Introduced in #96536

Linked PRs

• gh-111253: Fix socketmodule.c not checking for errors when initializing #111254
• [3.12] gh-111253: Fix error checking in _socket module init (GH-111254) #111299

[vstinner]

Fixed in 3.12 and main branches.