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ALSA: pcm: Fix poll error return codes
We can't return a negative error code from the poll callback the return type is unsigned and is checked against the poll specific flags we need to return POLLERR if we encounter an error. Signed-off-by: Charles Keepax <[email protected]> Reviewed-by: Takashi Sakamoto <[email protected]> Signed-off-by: Takashi Iwai <[email protected]>
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