Core/Misc: Fix static analysis issues

src/server/authserver/Server/AuthSession.h

@@ -37,7 +37,8 @@ class AuthSession : public Socket<AuthSession, ByteBuffer>
 public:
     static std::unordered_map<uint8, AuthHandler> InitHandlers();
 
-    AuthSession(tcp::socket&& socket) : Socket(std::move(socket), 1)
+    AuthSession(tcp::socket&& socket) : Socket(std::move(socket), 1),
+        _isAuthenticated(false), _build(0), _expversion(0), _accountSecurityLevel(SEC_PLAYER)
     {
         N.SetHexStr("894B645E89E1535BBDAD5B8B290650530801B18EBFBF5E8FAB3C82872A3E9BB7");
         g.SetDword(7);

src/server/game/Entities/Player/Player.cpp

@@ -13524,7 +13524,7 @@ void Player::AddItemToBuyBackSlot(Item* pItem)
                 // found empty
                 if (!m_items[i])
                 {
-                    slot = i;
+                    oldest_slot = i;
                     break;
                 }