Corpus for mknodat$null:

Coverage	Program
1767	perf_event_open-mknodat$null
1446	syz_mount_image$vfat-unlinkat-mknodat$null
538	syz_mount_image$ext4-mkdirat-rename-mount-open$dir-mknodat$null
480	syz_open_procfs-mknodat$null
33	mknodat$null