df: incorrect rounding behavior in Use% column

[cakebaker]

It looks like "GNU df" always rounds up the value in the "Use%" column, whereas "uutils df" doesn't. (I don't know why "GNU df" returns 28% for the /dev/sda8 filesystem, though, that seems incorrect)

$ df
Filesystem     1K-blocks      Used Available Use% Mounted on
dev              4006864         0   4006864   0% /dev
run              4014820      1340   4013480   1% /run
/dev/sda8      458091736 117418180 317380784  28% /
tmpfs            4014820     61244   3953576   2% /dev/shm
tmpfs            4014820      7012   4007808   1% /tmp
/dev/sda2         262144     83868    178276  32% /boot
tmpfs             802964        72    802892   1% /run/user/1000

$ ./target/debug/coreutils df
Filesystem          1k-blocks         Used    Available  Use% Mounted on       
dev                   4006864            0      4006864    0% /dev            
run                   4014820         1340      4013480    0% /run            
/dev/sda8           458091736    117418180    340673556   26% /               
tmpfs                 4014820        61244      3953576    2% /dev/shm        
tmpfs                 4014820         7012      4007808    0% /tmp            
/dev/sda2              262144        83868       178276   32% /boot           
tmpfs                  802964           72       802892    0% /run/user/1000