PVS-Studio warning V600 for MTASA

int CLuaFunctionDefs::GetPlayerSerial ( lua_State* luaVM )
{
  char szSerial [ 64 ];
  g_pCore->GetNetwork()->GetSerial(szSerial, sizeof(szSerial));

  if ( szSerial )
  {
    lua_pushstring ( luaVM, szSerial );
    return 1;
  }

  lua_pushboolean ( luaVM, false );
  return 1;
}

This suspicious code was found in MTASA project by PVS-Studio static code analyzer.
Warning message is:
V600 Consider inspecting the condition. The 'szSerial' pointer is always not equal to NULL. cluafunctiondefs.player.cpp 508

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