Normally a serial Bluetooth device is opened, TIOSETD'ed to N_HCI line
discipline, HCIUARTSETPROTO'ed and finally closed. In case the device
fails to HCIUARTSETPROTO, closing it produces a NULL pointer dereference.
Signed-off-by: NOhad Ben-Cohen <ohad@bencohen.org>
Signed-off-by: NMarcel Holtmann <marcel@holtmann.org>