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 v4.19.262 by commit 4befc7ffa18ef9a4b70d854465313a345a06862f. For more details please see the references link.