ALSA: pcm: Kill set_fs() in PCM OSS layer
This is the last-standing one: kill the set_fs() usage in PCM OSS layer by replacing with the new API functions to deal with the direct in-kernel buffer copying. The code to fill the silence can be replaced even to a one-liner to pass NULL buffer instead of the manual copying. Reviewed-by: Takashi Sakamoto <o-takashi@sakamocchi.jp> Signed-off-by: Takashi Iwai <tiwai@suse.de>
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