[NTOSKRNL:KE] Better Formatting

All NULL  dereferanced pointer are made nullptr to better comply with C++ 11

NTOSKRNL/KE/sringlock.cpp

@@ -89,7 +89,7 @@ KiFreeRingLockNode(
     }
 
     /*Clear hazard pointer if it's pointing to this node*/
-    if (InterlockedCompareExchangePointer((PVOID*)&Lock->HazardPointer, NULL, Node) == Node) {
+    if (InterlockedCompareExchangePointer((PVOID*)&Lock->HazardPointer,nullptr, Node) == Node) {
         LONG64 NewHead;
         do {
             NewHead = (Lock->Head + 1) & (RING_BUFFER_SIZE - 1);
@@ -138,7 +138,7 @@ KeAcquireSpinningRingLock(
     }
 
     /*Clear hazard pointer*/
-    InterlockedExchangePointer((PVOID*)&Lock->HazardPointer, NULL);
+    InterlockedExchangePointer((PVOID*)&Lock->HazardPointer, nullptr);
 }
 
 VOID
@@ -173,7 +173,7 @@ KeReleaseSpinningRingLock(
     Node->Next->Locked = 0;
 
     /*Clear hazard pointer*/
-    InterlockedExchangePointer((PVOID*)&Lock->HazardPointer, NULL);
+    InterlockedExchangePointer((PVOID*)&Lock->HazardPointer, nullptr);
 
     KiFreeRingLockNode(Lock, Node);
 }