This change helps to run script on machines with quite long uptime.
Without this the following error emerges:
umount: /mnt/tmp-ums-test: device is busy.
(In some cases useful info about processes that use
the device is found by lsof(8) or fuser(1))
mount: /dev/sdd6 already mounted or /mnt/tmp-ums-test busy
mount: according to mtab, /dev/sdd6 is already mounted on /mnt/tmp-ums-test
Signed-off-by: Lukasz Majewski <email@example.com>
Reviewed-by: Stephen Warren <firstname.lastname@example.org>