PAGE_POISONING -> PAGE_POISONING_ZERO

In fact, KSPP recommends PAGE_POISONING_ZERO.

kconfig_hardened_check/__init__.py

@@ -354,7 +354,7 @@ def construct_checklist(l, arch):
     l += [OR(OptCheck('self_protection', 'kspp', 'INIT_STACK_ALL', 'y'),
              OptCheck('self_protection', 'kspp', 'GCC_PLUGIN_STRUCTLEAK_BYREF_ALL', 'y'))]
     l += [OR(OptCheck('self_protection', 'kspp', 'INIT_ON_FREE_DEFAULT_ON', 'y'),
-             OptCheck('self_protection', 'kspp', 'PAGE_POISONING', 'y'))] # before v5.3
+             OptCheck('self_protection', 'kspp', 'PAGE_POISONING_ZERO', 'y'))] # before v5.3
     if arch in ('X86_64', 'ARM64', 'X86_32'):
         stackleak_is_set = OptCheck('self_protection', 'kspp', 'GCC_PLUGIN_STACKLEAK', 'y')
         l += [stackleak_is_set]