mISDN: fix misuse of put_device() in mISDN_register_device()
This is an automated ID intended to aid in discovery of potential security vulnerabilities. The actual impact and attack plausibility have not yet been proven. This ID is fixed in Linux Kernel version v4.14.300 by commit 81db4f182744acd004f17d7cc52dde9ea53467e6, it was introduced in version v4.14.299 by commit 080aabfb29b2ee9cbb8894a1d039651943d3773e. For more details please see the references link.