[Toybox] du -d0

[Ryan Prichard]

I noticed that the du toy ignores a -d0 option. (0 is the default
maxdepth.) Is this a bug?

With GNU coreutils and FreeBSD, du -d0 is the same as du -s. I tried to fix
toybox by defaulting TT.maxdepth to -1, but the argument parser didn't like
"d#<0=-1". IIRC, it didn't recognize '-' as starting a number.

-Ryan
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