ASoC: rt5677: Return error if devm_gpiod_get_optional return ERR_PTR
If devm_gpiod_get_optional() return ERR_PTR, it means something wrong so request gpio fails. We had better return error in such case. Signed-off-by: Axel Lin <axel.lin@ingics.com> Signed-off-by: Mark Brown <broonie@kernel.org>
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