[Toybox] [PATCH] tar: fix heap buffer overrun.

[enh]

tar was assuming the old behavior of dirtree_path() where there was
always a spare byte free at the end. Since removing that seems to have
been an intentional change to dirtree_path(), change the caller to
resize the string itself.

Caught by ASan.
---
 toys/posix/tar.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)
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