ASoC: samsung: midas_wm1811: Fix error code in probe()

This accidentally returns success instead of -EINVAL.

Fixes: c91d0c2e ("ASoC: samsung: midas_wm1811: Add GPIO-based headset jack detection")
Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
Acked-by: Artur Weber <aweber.kernel@gmail.com>
Link: https://lore.kernel.org/r/01590109-cf27-404b-88ff-b42bb73ca1c6@moroto.mountainSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/samsung/midas_wm1811.c

@@ -623,7 +623,7 @@ static int midas_probe(struct platform_device *pdev)
 
 		if (channel_type != IIO_VOLTAGE) {
 			dev_err(dev, "ADC channel is not voltage\n");
-			return ret;
+			return -EINVAL;
 		}
 
 		priv->gpio_headset_key = devm_gpiod_get(dev, "headset-key",