avoid compiler warning with DEBUGGING

[Eric Blake]

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I noticed a complaint about comparing signed and unsigned values, when
compiling with DEBUGGING enabled.  net.cc also has a lot of trailing blanks.

2009-05-20  Eric Blake  <ebb9@byu.net>

	* net.cc (gethostby_helper): Use correct signedness.

- --
Don't work too hard, make some time for fun as well!

Eric Blake             ebb9@byu.net
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