airpdcap: add free_key_string function, fix memleaks
Do not leak the key and SSID. Note that there are still some leaks in
the GTK UI related to get_wireshark_keys(), but I did not track them
down.
Caught by LeakSanitizer.
Change-Id: I639166e6ea457605d6ae0ebd58e56d7594a7b7db
Reviewed-on: https://code.wireshark.org/review/10860
Petri-Dish: Peter Wu <peter@lekensteyn.nl>
Tested-by: Petri Dish Buildbot <buildbot-no-reply@wireshark.org>
Reviewed-by: Michael Mann <mmann78@netscape.net>
Reviewed-by: Peter Wu <peter@lekensteyn.nl>