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'df' command used to display filesystem usage statistics as integer
values, in most cases rounding the actual value down. Because of
that 'df' tended to display faulty size values.
This fix to 'df' utility calculates the fractional part of the size,
then it rounds it when needed to the nearest one-digit integer value
and displays after decimal dot.

Change-Id: I9bc52635d45d3e55ce61b3b1c6b80d1267516e75

Filesystem             Size   Used   Free   Blksize
/dev                   164M    32K   164M   4096
/system                442M   117M   325M   4096
/cache                 492M     8M   483M   4096
/data                  984M    59M   925M   4096
/mnt/sdcard             12G    27M    12G   32768

Change-Id: I9a84b7b84ae528ee5cf0b1e92a8bee032b87703b