[Bug-tar] Combining --one-file-system with --listed-incremental broken in 1.24 and 1.25

[Matthew Gabeler-Lee]

Somewhere in the changes from 1.23 to 1.24, the combination of 
--one-filesystem with --listed-incremental was broken, and remained so in 1.25.

Example:

tar-1.23 --create --one-file-system --listed-incremental /tmp/xxx.list -f 
/tmp/xxx.tar --verbose /home
<prints lots of messages about backing up the contents of /home>

rm -f /tmp/xxx.{tar,list}

tar-1.24 <same args>
tar-1.24: /home: Directory is new
tar-1.24: Removing leading `/' from member names
/home/
<end>

No matter what path I pass it, it only includes that exact directory, no 
subdirectories or files whatsoever.  Removing either the --one-file-system 
or --listed-incremental argument restores it to proper behavior.

--
        -Matt
"Reality is that which, when you stop believing in it, doesn't go away".
                -- Philip K. Dick
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