cxl: fix possible null-ptr-deref in cxlguestinit_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 v5.10.163 by commit 170e8c2d2b61e15e7f7cfeded81bc1e959a15ed8, it was introduced in version v4.6 by commit 14baf4d9c739e6e69150512d2eb23c71fffcc192. For more details please see the references link.