[PATCH 0/5] MR4950: Extending dmime tests.

[eric pouech (＠epo)]

This serie is the first result of investigation of loops not
being played on dmusic for wave tracks.
It basically:
- extends tests so that we can check if loop work at some extend
  (they don't right now)
- add and fix a couple of existing tests.
And contain fixes for crufts in existing code:
- fix an errouneous prototype
- removed unused fields.