Corpus for add_key:

Coverage	Program
852	syz_io_uring_submit-add_key$keyring-add_key
716	add_key$keyring-add_key
702	add_key$keyring-add_key
582	add_key$keyring-add_key-keyctl$revoke
542	keyctl$update-keyctl$read-close_range-getsockopt$sock_cred-syz_usb_connect$cdc_ecm-timer_settime-ioctl$FS_IOC_FSGETXATTR-fsetxattr$security_ima-timer_gettime-timer_delete-perf_event_open-ioctl$F2FS_IOC_RESERVE_COMPRESS_BLOCKS-fsetxattr$security_ima-timer_create-add_key-clone3-syz_io_uring_submit-syz_io_uring_submit
540	keyctl$update-keyctl$read-close_range-getsockopt$sock_cred-syz_usb_connect$cdc_ecm-timer_settime-ioctl$FS_IOC_FSGETXATTR-fsetxattr$security_ima-timer_gettime-timer_delete-perf_event_open-ioctl$F2FS_IOC_RESERVE_COMPRESS_BLOCKS-fsetxattr$security_ima-timer_create-add_key-clone3-syz_io_uring_submit-syz_io_uring_submit
513	add_key$keyring-add_key
506	add_key
498	add_key
446	add_key
428	add_key
385	add_key$keyring-add_key$keyring-add_key
286	add_key
245	add_key