GSD-2022-1007975 capabilities: fix potential memleak on error path from vfs_getxattr_alloc()

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...