[vchkpw] vusagec math

[Igor Smitran]

I've noticed that vusagec calculates space based on file size, but it is 
prone to errors in case it needs to calculate many emails that are 
smaller than block size.
In case file size is smaller than block size file system will use e.g. 
4KB for that file and vusagec will calculate real size. In my example 
file system is giving me 230 GB used space and vusagec gives me 100GB 
used space. It is huge error in my opinion.

Igor
!DSPAM:4cf3844e32717167543951!