PVS-Studio warning V522 for ReactOS

static void
acpi_bus_notify (....)
{
  struct acpi_device *device = NULL;
  ....
  switch (type) {
    ....
    case ACPI_NOTIFY_EJECT_REQUEST:
      DPRINT1("Received EJECT REQUEST "
              "notification for device [%s]\n",
              device->pnp.bus_id);
      /* TBD */
      break;
    ....
  }
}

This suspicious code was found in ReactOS project by PVS-Studio static code analyzer.
Warning message is:
V522 Dereferencing of the null pointer 'device' might take place. bus.c 762

PVS-Studio is a static analyzer for detecting bugs in the source code of applications written in C, C++, C++11, C++/CX. Site: http://www.viva64.com/en/pvs-studio/