[PATCH] mfreadwrite: Simplify iteration through streams.

[Marvin]

Hi,

While running your changed tests, 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=87710

Your paranoid android.


=== build (build log) ===

Task: Patch failed to apply