tpm: fix reference counting for struct tpm_chip
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 v4.19.238 by commit cb64bd038beacb4331fe464a36c8b5481e8f51e2, it was introduced in version v4.12 by commit fdc915f7f71939ad5a3dda3389b8d2d7a7c5ee66. For more details please see the references link.