dsound/mixer.c fixed writing outside of buffer in DSOUND_PhaseCancel()

[Tomas Vanek]

Moorhuhn_we failed when introduction music crossfades to game sound on wine20041019 and later.
Now it works again.
To anybody who knows more about DSOUND buffers:
	Please recheck why PhaseCancel tries to process more bytes then buffer length.

Changelog:
Fixed writing memory outside of sound buffer in DSOUND_PhaseCancel()

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