dbus: client: notify: free chip and line lists at exit

dbus: client: notify: free chip and line lists at exit

We don't free the lists storing line and chip objects for the duration
of the program when exiting. Fix it.

Note: these objects need to be kept alive for D-Bus events to work.

Fixes: a5ab76da1e0a ("dbus: add the D-Bus daemon, command-line client and tests")
Link: https://lore.kernel.org/r/20241007-dbus-memory-fixes-v1-2-0d56d1aa032d@linaro.org
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>