Corpus for add_key$user:

Coverage	Program
987	add_key$user-keyctl$read
661	add_key$user-keyctl$KEYCTL_MOVE
551	add_key$user
542	syz_80211_join_ibss-add_key$user
414	keyctl$set_timeout-add_key-socket$inet6_icmp_raw-lseek-timer_delete-ioctl$TIOCGSID-perf_event_open-timer_create-add_key$user
403	perf_event_open-add_key$user