CVE-2024-46739 uio_hv_generic: Fix kernel NULL pointer dereference in hv_uio_rescind

In the Linux kernel, the following vulnerability has been resolved: uiohvgeneric: Fix kernel NULL pointer dereference in hvuiorescind For primary VM Bus channels, primarychannel pointer is always NULL. This pointer is valid only for the secondary channels. Also, rescind callback is meant for...