Corpus for keyctl$unlink:

Coverage	Program
388	add_key$fscrypt_v1-perf_event_open-keyctl$unlink
336	syz_open_procfs$namespace-ioctl$NS_GET_PARENT-perf_event_open-add_key$keyring-keyctl$unlink-add_key$keyring-ioctl$NS_GET_USERNS-add_key$keyring-keyctl$chown-keyctl$KEYCTL_MOVE-add_key$keyring-keyctl$KEYCTL_MOVE-request_key-openat$sr-accept4$packet-add_key$keyring-add_key
234	add_key$fscrypt_v1-keyctl$unlink
45	keyctl$unlink