check_disk: reduced compiler warnings (#1326)

[Oliver Skibbe]

Ah okay, didnt know that. I changed uintmax_t to long long and %ju to %llu

result @ Ubuntu 12.04 3.13.0-65-generic #105~precise1-Ubuntu SMP Tue Sep 22
13:22:42 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux
```
./check_disk -vvv -w 10% -c 5%	-p /
calling stat on /
Thresholds(pct) for / warn: 10,000000 crit 5,000000
calling stat on /
For /, used_pct=82 free_pct=18 used_units=56842 free_units=13248
total_units=73214 used_inodes_pct=11 free_inodes_pct=89
fsp.fsu_blocksize=4096 mult=1048576
Freespace_units result=0
Freespace% result=0
Usedspace_units result=0
Usedspace_percent result=0
Usedinodes_percent result=0
Freeinodes_percent result=0
DISK OK - free space: / 13248 MB (18% inode=89%);|
/=56842MB;65892;69553;0;73214
```

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