DSOUND: prevent assertion in mixer.c

[Alex Villací­s Lasso]

Tested program was a Japanese RPG trial from LittleWitch 
(http://www.littlewitch.jp/sirotume.exe). This game runs until the shot 
of a girl in a water tank, and at that spot, unless the attached patch 
is applied, the following assertion is triggered at dlls/dsound/mixer.c:

wine-pthread: mixer.c:386: DSOUND_MixInBuffer: Assertion `adjusted_remainder >= 0' failed.
wine: Unhandled exception (thread 000a), starting debugger...
WineDbg starting on pid 0x8

Changelog:
* Prevent dsb->buf_mixpos from ever remaining past dsb->buflen even if 
not in DSBPLAY_LOOPING case, to prevent assertion failure in 
DSOUND_MixInBuffer.
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