ASoC: wm8524: Do not print probe defer error

On an imx8mq-evk the following error is seen:

[    1.375809] wm8524-codec audio-codec: Failed to get mute line: -517

It happens because the codec driver may probe prior to the imx gpio
driver, which causes a probe defer.

Change to dev_err_probe() to avoid printing this error.

Reported-by: Chris Healy <cphealy@gmail.com>
Signed-off-by: Fabio Estevam <festevam@gmail.com>
Link: https://lore.kernel.org/r/20210301193328.2123511-1-festevam@gmail.com


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