Re: [PATCH v2 0/1] MR3854: winmm: Avoid use of hardcoded return values.

[Alistair Leslie-Hughes (＠alesliehughes)]

Yes, currently MCI_MapMsgAtoW returns a tri-state.
-1 = Memory allocation error
0  = No unmap required
1  = Unmap required.

Since MCI_UnmapMsgAtoW handles all the cases where MCI_MapMsgAtoW allocates memory. Why not just
call MCI_UnmapMsgAtoW to do its thing in all cases?

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https://gitlab.winehq.org/wine/wine/-/merge_requests/3854#note_47342