Initialize system PTEs with arch-specific list terminator

xtoskrnl/mm/data.cc

@@ -97,6 +97,9 @@ MMPFNLIST MM::Pfn::ZeroedPagesList = {0, ZeroedPageList, MAXULONG_PTR, MAXULONG_
 /* Array of lists for available System PTEs, separated by pool type */
 MMPTE MM::Pte::FirstSystemFreePte[MaximumPtePoolTypes];
 
+/* PTE list terminator */
+ULONG_PTR MM::Pte::ListTerminator;
+
 /* Virtual base address of the System PTE space */
 PMMPTE MM::Pte::SystemPteBase;