RFR: 8170544: Fix code scan findings in libnet

[Langer, Christoph]

Hi,

please review the following change:

Bug: https://bugs.openjdk.java.net/browse/JDK-8170544
Webrev: http://cr.openjdk.java.net/~clanger/webrevs/8170544.0/

With this change I change some function signatures to use SOCKETADDRESS * instead of struct sockaddr * where appropriate. This fixes some code scan findings, which reported the fact that it's dangerous to pass struct socaddr * pointers and then cast it to the wider struct sockaddr_in6. I think this makes the code cleaner and spares some casts at several places.

Please review and run through JPRT testing.

Thanks
Christoph


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