RFR: JDK-8320168: handle setsocktopt return values [v3]

[Lutz Schmidt]

On Thu, 16 Nov 2023 15:52:02 GMT, Matthias Baesken <mbaesken at openjdk.org> wrote:

>> There are a few places in the JDK C coding where the setsocktopt return value is not handled but better should be handled.
>
> Matthias Baesken has updated the pull request incrementally with one additional commit since the last revision:
> 
>   do not change old legacy src/java.base/unix/native/libnet/SdpSupport.c

LGTM with all of Alan's comments considered.

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Marked as reviewed by lucy (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/16684#pullrequestreview-1736701866