x86/hyperv: Fix NULL deref in sethvtscchange_cb() if Hyper-V setup fails
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 v4.19.218 by commit b20ec58f8a6f4fef32cc71480ddf824584e24743, it was introduced in version v4.16 by commit 93286261de1b46339aa27cd4c639b21778f6cade. For more details please see the references link.