RFR(S): 8163181: Further improvements for Unix NetworkInterface native implementation

[Langer, Christoph]

Hi,

I had made a few more cleanups when I was working on NetworkInterface.c which I thought are worth contributing.

Please review: http://cr.openjdk.java.net/~clanger/webrevs/8163181.1/
Bug: https://bugs.openjdk.java.net/browse/JDK-8163181

As always, changes were built and tested on Linux, AIX, Solaris and Mac.

Thanks
Christoph

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