capabilities: fix potential memleak on error path from vfsgetxattralloc()
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 v5.15.78 by commit 2de8eec8afb75792440b8900a01d52b8f6742fd1, it was introduced in version v4.14 by commit 8db6c34f1dbc8e06aa016a9b829b06902c3e1340. For more details please see the references link.