ASoC: fsl_spdif: Fix incorrect usage of regmap_read()
We should not copy the return value into this val since it's supposed to get the value of the register not the success result of regmap_read(). Thus fix it. Signed-off-by: NNicolin Chen <Guangyu.Chen@freescale.com> Signed-off-by: NMark Brown <broonie@linaro.org>
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