RFR 8216355: missing NULL checks in libnet in interface iteration and potential resource leak in getMacAddress

[Baesken, Matthias]

Hello, please review the following fix .

In NetworkInterface.c and Inet6AddressImpl.c we have some coding that omits checking for ifa_addr == NULL when iterating on the result of the getifaddrs call.
This is similar to what has been fixed in hotspot with

https://bugs.openjdk.java.net/browse/JDK-8208676

The issues are in the bsd/macOS coding. However bsd/macOS also document that ifa_addr can be NULL in special cases (not sure how likely it is to see it "in the wild").
See


https://www.freebsd.org/cgi/man.cgi?getifaddrs

https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man3/getifaddrs.3.html


Additionally  a small resource  leak  in NetworkInterface.c   is fixed.

Bug/webrev :

https://bugs.openjdk.java.net/browse/JDK-8216355


http://cr.openjdk.java.net/~mbaesken/webrevs/8216355.1/


Best regards, Matthias
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