Fix tree node scanning

 - Bail early on empty directories without touching the meta readers.
 - Aport the directory read loop if we can't even read a header anymore,
   no matter if there are bytes remaining.
 - Also add that same condition to the inner loop.

The later two actually caused a numeric overflow on some particularly
malformed squashfs images, going into a RAM filling infinite loop.

Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>

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