mISDN: fix misuse of putdevice() in mISDNregister_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 v4.9.334 by commit 44658d65f6b3118f595a1229d7eed74845a5e2ac, it was introduced in version v4.9.333 by commit d1d1aede313eb2b9a84afd60ff6cfb7c33631e0e. For more details please see the references link.