[rdiff-backup-users] fix for error when trying to clean up a full filesystem

[John Soros]

Here (attached) is a quick fix i applied to rdiff-backup so i didn't have to 
start the backup all over, my disk got full and we are (unfortunately) still 
not using lvm.
I am not sure as to the cleanliness of the patch, but it seems to be working 
fine, hopefully this can be helpful, as i think having a disk full with rdiff-
backup is a PITA...

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