Corpus for mknodat$null:

Coverage	Program
1650	fsopen-fsconfig$FSCONFIG_CMD_CREATE-fsmount-mknodat$null
1410	syz_mount_image$vfat-mknodat$null
1041	syz_mount_image$tmpfs-openat$dir-mknodat$null
564	syz_mount_image$ext4-mount-open-mknodat$null