dpnet: Improve Error checking in Get/Set SP (try 3 Resend )

[Marvin]

Hi,

While running your changed tests on Windows, I think I found new failures.
Being a bot and all I'm not very good at pattern recognition, so I might be
wrong, but could you please double-check?
Full results can be found at
https://testbot.winehq.org/JobDetails.pl?Key=6231

Your paranoid android.


=== build (build) ===
Missing build status line