I wonder if it would be simpler to set non-zero exit only
if this is the first path returned from tree_next() ...

Hmm... I considered this, but I wasn't sure if there were any edge
cases where the first path returned by tree_next might not be the
path passed to tree_open; so I decided to take the route which I
knew would always work.

What if someone gives more than one path to tar?

The function in question (write_heirarchy) is called once
for each command-line argument.

Tim Kientzle
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