Small improvements to Inet6 implementation (unix)

[Martin Buchholz]

Hi net maintainers,

I'd like you to do a code review.

I got frustrated with incomplete information from exceptions thrown from
java.net, so I hacked up some fixes for them.  This is the result.

generify; remove compiler warnings, typos, casts; return status
information via gai_strerror when getaddrinfo fails


http://cr.openjdk.java.net/~martin/webrevs/openjdk7/netErrors/<http://cr.openjdk.java.net/%7Emartin/webrevs/openjdk7/netErrors/>

But... I don't know what I'm doing here, and the underlying bug I was
tracking down is fixed, so it's hard for me to test my code changes. It
would be good if a java.net maintainer would add a test case, or at least
verify my exception improvements with an ad hoc test.

Thanks,

Martin
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