[PATCH 1/2] mmsystem: Fix some MCI mappings.

[Joerg-Cyril.Hoehle at t-systems.com]

Hi,

this merges past changes to 32bit MCI into the 16 bit mmsystem:

- MCI_OPEN conditionally copies the extra DGV or WAVE OPEN elements.
- Likewise MCI_DGV_STATUS_REFERENCE
- string results are converted on success only.
- MCI_INFO counts dwRetSize in chars, not bytes.
- TRACE(MAP_MSGERROR) is already covered by a FIXME.
 
Furthermore, I partly reverted Damjan's changes on return from the
function. There's no need to update mdsp16->dwCallback, Item or Track.
They are input parameters, not output.

+            mip16->dwRetSize = mip32w->dwRetSize;
MCI_INFO's dwRetSize might be updated (MSDN documents this for the
VCR device only), but my past tests showed that an update happens only
since NT (not w9x), for some of the devices (wave, midi and mcicda IIRC,
see comment in their code).
Nevertheless I choose to let this layer update that slot (despite Wine's MCI
devices won't, so the original value will be written back).

Regards,
	Jörg Höhle
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