wait_for_usb() LN# 793-800

# LN# 793-800 of /initrd/init (tahrpup) - https://www.pearltrees.com/s243a/initrd-init/id19535893/item224276025
# LN# 853-860 of https://github.com/puppylinux-woof-CE/woof-CE/blob/c96d661c2232caef1d69c693de673fb0e54796f8/initrd-progs/0initrd/init#L853 (13 Mar 2018)
wait_for_usb() {
 [ -e /tmp/flag-usb-ready ] && return
 echo -n "${L_WAITING_FOR_USB}" > /dev/console
 /sbin/wait4usb
 get_part_info
 BLKIDOUT=""
 check_status 0
}