[PATCH 2/2] dmime/tests: Add an invalid stream test

[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=36670

Your paranoid android.


=== wvistau64 (32 bit dmime) ===
dmime.c:792: Test failed: ParseDescriptor failed: 80004003, expected E_INVALIDARG

=== w7u (32 bit dmime) ===
dmime.c:792: Test failed: ParseDescriptor failed: 80004003, expected E_INVALIDARG