cxl: fix possible null-ptr-deref in cxl_pci_init_afu|adapter()
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 v6.0.16 by commit 139abd4c626a6f7ce02789ed5f73aa2256e0542b, it was introduced in version v3.18 by commit f204e0b8cedd7da1dfcfd05ed6b7692737e24029. For more details please see the references link.