media: cx88: Fix a null-ptr-deref bug in buffer_prepare()
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 v5.10.150 by commit c2257c8a501537afab276c306cb717b7260276e1. For more details please see the references link.