[PATCH 1/2] midimap: Perform stricter error-checking.

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

Hi,

I think it's best for the next two patches to stay together.

The one line
-    if (lpMidiHdr->dwFlags & (MHDR_ISSTRM|MHDR_PREPARED))
was a plain bug that prevented a MIDIHDR from being submitted repeatedly.  I.e. I expect the following sequence to work
dwFlags=0; Prepare; Submit; Unprepare; /*Leaving flags as is */; Prepare; ...

Regards,
	Jörg Höhle
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