[PATCH RFC 4/5] dsound: Clean up channels

[Alexander E. Patrakov]

The infrastructure set up in the "Replace convert() functions with
get() and put()" also allows to convert the number of channels more
elegantly. See how much deeply-nested code and complex conditions was
removed from cp_fields() :)

Yes, I know that, if wine supported 5.1 primary buffers, the refactoring
would not be 100% equivalent for the 5.1 -> 5.1 case. In fact, the
extra channels are not dropped anymore. Can anyone check if this is
enough to allow 5.1 primary buffers?

-- 
Alexander E. Patrakov
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