tools/hciconfig: Add missing hci_close_dev
tools/hciconfig: Add missing hci_close_dev

Add hci_close_dev for commands using hci_open_dev, this is mostly to be
consistent with other commands that do cleanup but in practice makes no
difference since hciconfig will exit anyway.

ComputeCycles/bluez,ComputeCycles/bluez,ComputeCycles/bluez,ComputeCycles/bluez