RFR: 8362884: [GCC static analyzer] unix NetworkInterface.c addif leak on early returns

[Volkan Yazici]

Fixes `NetworkInterface.c::addif` memory leak on early returns. Issue reproduction is difficult – didn't add a test.

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Commit messages:
 - Release earlier allocations after `malloc()` failure

Changes: https://git.openjdk.org/jdk/pull/26952/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=26952&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8362884
  Stats: 14 lines in 1 file changed: 11 ins; 0 del; 3 mod
  Patch: https://git.openjdk.org/jdk/pull/26952.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/26952/head:pull/26952

PR: https://git.openjdk.org/jdk/pull/26952