Apply nullptr across the tree (#7890)

libcockatrice_network/libcockatrice/network/server/remote/game/server_card.cpp

@@ -38,7 +38,7 @@
 
 Server_Card::Server_Card(const CardRef &cardRef, int _id, int _coord_x, int _coord_y, Server_CardZone *_zone)
     : zone(_zone), id(_id), coord_x(_coord_x), coord_y(_coord_y), cardRef(cardRef), tapped(false), attacking(false),
-      facedown(false), destroyOnZoneChange(false), doesntUntap(false), parentCard(0), stashedCard(nullptr)
+      facedown(false), destroyOnZoneChange(false), doesntUntap(false), parentCard(nullptr), stashedCard(nullptr)
 {
 }
 
@@ -46,7 +46,7 @@ Server_Card::~Server_Card()
 {
     // setParentCard(0) leads to the item being removed from our list, so we can't iterate properly
     while (!attachedCards.isEmpty()) {
-        attachedCards.first()->setParentCard(0);
+        attachedCards.first()->setParentCard(nullptr);
     }
 
     if (parentCard) {

libcockatrice_network/libcockatrice/network/server/remote/game/server_game.cpp

@@ -127,7 +127,7 @@ Server_Game::~Server_Game()
 
     room->removeGame(this);
     delete creatorInfo;
-    creatorInfo = 0;
+    creatorInfo = nullptr;
 
     gameMutex.unlock();
     room->gamesLock.unlock();

libcockatrice_network/libcockatrice/network/server/remote/game/server_game.h

@@ -245,7 +245,7 @@ public:
     void createGameJoinedEvent(Server_AbstractParticipant *participant, ResponseContainer &rc, bool resuming);
 
     GameEventContainer *
-    prepareGameEvent(const ::google::protobuf::Message &gameEvent, int playerId, GameEventContext *context = 0);
+    prepareGameEvent(const ::google::protobuf::Message &gameEvent, int playerId, GameEventContext *context = nullptr);
     GameEventContext prepareGameEventContext(const ::google::protobuf::Message &gameEventContext);
 
     void sendGameStateToPlayers();