Reduce latency when using the SNDCTL_DSP_RESET ioctl by calling chn_resetbuf().
Reduce latency when using the SNDCTL_DSP_RESET ioctl by calling
chn_resetbuf().

Submited by:	Pyun YongHyeon <yongari@kt-is.co.kr>
Approved by:	tanimura (mentor)

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