RFR: 8275640 (win) java.net.NetworkInterface issues with IPv6-only environments [v7]

[Daniel Jeliński]

> Clean up of various issues related to error handling and memory management

Daniel Jeliński has updated the pull request incrementally with one additional commit since the last revision:

  Initialize return value in all cases

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/6090/files
  - new: https://git.openjdk.java.net/jdk/pull/6090/files/98b40812..cdb86b5c

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=6090&range=06
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=6090&range=05-06

  Stats: 13 lines in 2 files changed: 12 ins; 1 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/6090.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/6090/head:pull/6090

PR: https://git.openjdk.java.net/jdk/pull/6090