Corpus for mknodat$null:

Coverage	Program
3801	seccomp$SECCOMP_SET_MODE_FILTER_LISTENER-mknodat$null-lsetxattr$trusted_overlay_upper
2952	seccomp$SECCOMP_SET_MODE_FILTER_LISTENER-mknodat$null
554	perf_event_open-syz_mount_image$ext4-mount-openat$dir-mknodat$null
296	syz_mount_image$ext4-chdir-openat-openat-perf_event_open-ioctl$int_in-mkdirat-openat-poll-clock_gettime-ioctl$F2FS_IOC_START_VOLATILE_WRITE-syz_open_dev$sg-openat$cdrom-mq_timedsend-copy_file_range-readv-mknodat$null-fsetxattr$trusted_overlay_redirect-fcntl$setstatus