ASoC: qcom: Fix error code in lpass_platform_copy()

The copy_to/from_user() functions return the number of bytes remaining
to be copied.  This function needs to return negative error codes
because snd_soc_pcm_component_copy_user() treats positive returns as
success in soc_component_ret().

Fixes: 7d720955

 ("ASoC: qcom: Add support for codec dma driver")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Link: https://lore.kernel.org/r/20220301081104.GB17375@kili


Signed-off-by: Mark Brown <broonie@kernel.org>